Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
truong va » truong dai, truong cao, truong dao
hang nong » thang long, han tong
tap toan » tap doan, tap quan
bai toan » bai tap

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

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