Perhaps you should try some spelling variations:
chau tinh » cuu tinh, ha tinh, cua tinh
trang van » tran van, trong van, tang van
dung cong » dung trong
doi chau » doi chieu, gioi chau, hoi chu
trang va » tran van, hang va
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren tap » tren tau, tuyen tap, tieng tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chau tinh - hanh ((trang van) or (trang va)) dung cong tac tren tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chau tinh - hanh ((trang van) OR (trang va)) dung cong tac tren tap.
• Adding a wildcard symbol may retrieve word variants: doi chau tinh - hanh ((trang van) or (trang va)) dung cong tac tren tap*.