Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
luong toan » luong thanh, truong toan, luong tai
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
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: hoc thieu xanh - ((thanh trung) or (thanh tung)) va ((nhung cong) OR (dung cong)) luong toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((thanh trung) OR (thanh tung)) va ((nhung cong) OR (dung cong)) luong toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((thanh trung) or (thanh tung)) va ((nhung cong) OR (dung cong)) luong toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh trung) or (thanh tung)) va ((nhung cong) OR (dung cong)) luong toan cao*.