шинохтан: to know, to recognize

Шумо падарамро мешиносед?
Do you know my father?
Овози ӯро мешиносанд.
They recognize (know) his voice.

Tajik proverb: Кӯр кӯрро шаби торик мешиносад.
If you want to learn more Tajik sayings and proverbs you can download a PDF with a long list of them here: Tajik Sayings and Proverbs.

ҷустуҷӯ кардан

ҷустуҷӯ кардан: to search

Чаро шумо зиндаро дар миёни мурдагон ҷустуҷӯ мекунед?
Why do you search for the living among the dead.

Tajik websites like Asia-Plus use the word ҷустуҷӯ in the search box to search their site.
Another common usage of the word ҷустуҷӯ is in оперативӣ – ҷустуҷӯӣ, or search operation, as in a search that might be conducted by the Department of Customs.