Perhaps you should try some spelling variations:
hanh trinh » canh tranh
doi chieu » doi chi, ho chieu, mot chieu
toan dung » tran dung, toan ung, tan dung
dung cong » dung trong
ban thanh » ban hanh, ban hang
thanh ban » thanh san, thanh van, thanh bac
doc hieu » toc thieu, hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) xanh - ((hanh trinh) OR (hanh chinh)) toan dung cong ban thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) xanh - ((hanh trinh) OR (hanh chinh)) toan dung cong ban thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) xanh - ((hanh trinh) OR (hanh chinh)) toan dung cong ban thanh ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) xanh - ((hanh trinh) OR (hanh chinh)) toan dung cong ban thanh ban*.