Perhaps you should try some spelling variations:
hanh trong » hanh trang, anh trong, hinh trong
cong thanh » dong thanh, cong trinh, cong tan
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
trong he » trong le, trong hiep, trong nha
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - hanh trong he thong ((cong dan) or (cong thanh)) ((phan cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trong he thong ((cong dan) OR (cong thanh)) ((phan cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trong he thong ((cong dan) or (cong thanh)) ((phan cau) or (than cap))*.