Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
lanh manh » lanh tranh, lan anh, van manh
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
hieu van » hieu va, thien van, lieu va
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thien ((hieu van) or (nhieu tang)) - lanh manh ((cua thong) OR (cua khong)) cong tac than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien ((hieu van) OR (nhieu tang)) - lanh manh ((cua thong) OR (cua khong)) cong tac than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien ((hieu van) or (nhieu tang)) - lanh manh ((cua thong) OR (cua khong)) cong tac than tap".
• Adding a wildcard symbol may retrieve word variants: thien ((hieu van) or (nhieu tang)) - lanh manh ((cua thong) OR (cua khong)) cong tac than tap*.