Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
cong cang » cong cong, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
thong cao » thong cac, thong cap, thong cau
trinh va » trinh vat, trinh ve, trinh vi

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