Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chua dong » ha dong, huy dong, hoa dong
doc hieu » toc thieu, hoc thieu, hoc hien
chao chu » cho chu, cua chu, cao cho
cua dong » cua cong, cua dang, cua nong
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cao » toan cao, thai cao, than cap

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) or (chao chu)) xanh - hanh tranh ((cua dong) OR (chua dong)) cong van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (chao chu)) xanh - hanh tranh ((cua dong) OR (chua dong)) cong van than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (chao chu)) xanh - hanh tranh ((cua dong) OR (chua dong)) cong van than cao".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (chao chu)) xanh - hanh tranh ((cua dong) OR (chua dong)) cong van than cao*.