Perhaps you should try some spelling variations:
dong thanh » truong thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh tang » hanh trang, anh tang, hanh mang
thanh cac » hanh cac, thanh bac, thanh ca
doc hieu » toc thieu, hoc thieu, hoc hien
cua dong » chua dong, cua cong, cua dang
cua nong » cua cong, cuu nong, cua song

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 tang ((cua dong) or (cua nong)) cong dong thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tang ((cua dong) OR (cua nong)) cong dong thanh cac.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tang ((cua dong) or (cua nong)) cong dong thanh cac*.