Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
cong quang » luong quang, thong quang, duong quang
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
cong lang » cong vang, cong luong, cong ngang
trinh va » trinh van, trinh ve, trinh vi
toan ban » van ban

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