Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cong sang » cong san, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
trinh vi » trinh va, trinh viet, trinh van
trinh ve » trinh he, trinh va, trinh viet
thai cao » tai cao, thoai cac, thuat cao

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 vi) or (trinh ve)) nhung ((cong sang) OR (cong lang)) thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((trinh vi) OR (trinh ve)) nhung ((cong sang) OR (cong lang)) thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh ((trinh vi) or (trinh ve)) nhung ((cong sang) OR (cong lang)) thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trinh vi) or (trinh ve)) nhung ((cong sang) OR (cong lang)) thai cao*.