Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoang manh » hoang minh, hoang anh, hoang thanh
hoang xanh » hoang anh, hoang van, hoang minh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tap toan » tap doan, tap quan, bai toan
van tuan » van quan, van ban, anh tuan

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 - ((hoang manh) or (hoang xanh)) va nhung cong ((tap toan) or (van tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hoang manh) OR (hoang xanh)) va nhung cong ((tap toan) OR (van tuan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hoang manh) or (hoang xanh)) va nhung cong ((tap toan) or (van tuan)) cao*.