Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh va » trinh van, trinh vat, trinh ve
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (chieu tinh)) - canh ((trinh va) or (trang va)) nhung cong tan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (chieu tinh)) - canh ((trinh va) OR (trang va)) nhung cong tan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (chieu tinh)) - canh ((trinh va) or (trang va)) nhung cong tan chan cau*.