Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh hang » thanh hang, hang hang, hanh han
nang cong » nang song, dang cong, bang cong
hang van » hoang van, hang va, dang van
van nang » van quang, van ban, van dong
cong tan » cong tac, cong san, cong thanh
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet tach - hanh hang van nang cong tan ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh hang van nang cong tan ((toan tai) OR (toan cao))*.