Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
vat dung » van dung, va dung, viet dung
doan van » doan va, hoang van, luan van
dan van » dang van, tan van, san van
dao van » do van, dang van

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