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

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 - canh tranh va nhung cong ((tap toan) or (((van tan) OR (van tuan)))) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh va nhung cong ((tap toan) OR (((van tan) OR (van tuan)))) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh tranh va nhung cong ((tap toan) or (((van tan) OR (van tuan)))) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh va nhung cong ((tap toan) or (((van tan) OR (van tuan)))) ban*.