Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh thanh » nhanh thanh, thanh toan, thanh phan
tranh hang » trinh han, tran hoang, tran hong
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu quang - ((thanh thanh) or (tranh hang)) va ((nhung cong) OR (hang cong)) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - ((thanh thanh) OR (tranh hang)) va ((nhung cong) OR (hang cong)) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - ((thanh thanh) or (tranh hang)) va ((nhung cong) OR (hang cong)) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - ((thanh thanh) or (tranh hang)) va ((nhung cong) OR (hang cong)) tac toan tap*.