Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
tung tang » trung tang, trung thang, hung thang
tang dung » tang duong, dang dung, tan dung
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cac » phan cac, chon cac, nhan cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (hoc thieu)) tinh - thanh tung tang dung cong tan chan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (hoc thieu)) tinh - thanh tung tang dung cong tan chan cac*.