Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cong lang » cong luong, cong quang, cong ngang
cong vang » cong quang, cong ngang, cong san
trinh ve » trinh he, trinh va, trinh viet
trinh vi » trinh va, trinh viet, trinh van
toan cau » toan cao, toan ban, toan 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 ((trinh ve) OR (trinh vi)) nhung ((cong lang) or (cong vang)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trinh ve) OR (trinh vi)) nhung ((cong lang) OR (cong vang)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trinh ve) OR (trinh vi)) nhung ((cong lang) or (cong vang)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trinh ve) OR (trinh vi)) nhung ((cong lang) or (cong vang)) toan cau*.