Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
trang cua » tranh cua, tang cua, trung cua
hang cong » dang cong, hang nong, bang cong
tan toan » tan tran, tap toan, van toan
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: hoc thieu xanh - hanh trang cua ((nhung cong) OR (hang cong)) ((tan toan) or (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh trang cua ((nhung cong) OR (hang cong)) ((tan toan) OR (bai toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh trang cua ((nhung cong) OR (hang cong)) ((tan toan) or (bai toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh trang cua ((nhung cong) OR (hang cong)) ((tan toan) or (bai toan)) ban*.