Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
hanh sinh » hanh tinh, hanh dinh, hinh sinh
tai cao » thai cao, tai sao, tai cac
tao cao » bao cao, toan 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 - hanh sinh vat ((nhung cong) or (thong cong)) van ((tai cao) or (tao cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh sinh vat ((nhung cong) OR (thong cong)) van ((tai cao) OR (tao cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh sinh vat ((nhung cong) or (thong cong)) van ((tai cao) or (tao cao))*.