Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
cong san » cong tac
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap

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 ve)) dung cong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((trinh va) OR (trinh ve)) dung cong san than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trinh va) or (trinh ve)) dung cong san than cao*.