Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
theo chu » theo chieu, cho chu, chao chu
cua dung » cua dang, cua dong, qua dung
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 (theo chu)) xanh - ((hanh tranh) OR (hanh trinh)) cua dung cong van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chu)) xanh - ((hanh tranh) OR (hanh trinh)) cua dung cong van than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo chu)) xanh - ((hanh tranh) OR (hanh trinh)) cua dung cong van than cao".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chu)) xanh - ((hanh tranh) OR (hanh trinh)) cua dung cong van than cao*.