Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trong » hanh trang, anh trong, hinh trong
nhung cong » dung cong, thong cong, hang cong
trong cao » truong cao, trong cac, trong ca
dang cong » dung cong
trinh vat » trinh van, trinh luat, sinh vat
vat ban » van ban, va ban, vat ran

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