Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
phung cong » nhung cong, phong cong, nhung chong
trinh lan » trinh luan, trinh han, trinh san
hung cong » nhung cong, hung cuong, dung cong
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

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