Perhaps you should try some spelling variations:
tien thanh » tran thanh, den thanh
nhung cong » dung cong, thong cong, hang cong
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » 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 ((tien thanh) or (tien thinh)) - canh ((trinh va) or (trinh ve)) nhung cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien thanh) OR (tien thinh)) - canh ((trinh va) OR (trinh ve)) nhung cong van toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien thanh) or (tien thinh)) - canh ((trinh va) or (trinh ve)) nhung cong van toan cau*.