Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tap

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 ((tranh cua) or (trung cua)) thong ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((tranh cua) OR (trung cua)) thong ((cong dan) OR (cong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((tranh cua) or (trung cua)) thong ((cong dan) or (cong tan)) toan cau*.