Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, hieu van
hoc nhung » hoa nhung, hon nhung, nuoc nhung
tung hoc » trung hoc, tuong hoc, dung hoc
cong tap » cuong tap, cong tan, tong tap
cong tac » cong ty
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: theo ((hieu lang) or (nhieu tang)) - thanh tung hoc nhung ((cong tap) OR (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (nhieu tang)) - thanh tung hoc nhung ((cong tap) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (nhieu tang)) - thanh tung hoc nhung ((cong tap) OR (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (nhieu tang)) - thanh tung hoc nhung ((cong tap) OR (cong tac)) toan cao*.