Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh dong » anh dong, ha dong
doc hieu » toc thieu, hoc thieu, hoc hien
tung cap » trung cap, thong cap, trong cap
cung cap » trung cap
dong san » cong san, dong bang, dong von
phan dau » hang dau

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 - thanh ((tung cap) OR (cung cap)) hanh dong san ((phan tu) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((tung cap) OR (cung cap)) hanh dong san ((phan tu) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh ((tung cap) OR (cung cap)) hanh dong san ((phan tu) or (phan dau))".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung cap) OR (cung cap)) hanh dong san ((phan tu) or (phan dau))*.