Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hoc nhieu » hoc thieu, hoc nhiet, hop nhieu
tung cua » trung cua, tuong cua, dung cua
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

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