Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, mot chieu
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
ho chieu » theo chieu, hoc thieu, mot chieu
phan lap » phan dau
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - hanh trinh ((va hang) OR (va nang)) cong luan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hanh trinh ((va hang) OR (va nang)) cong luan phan lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - hanh trinh ((va hang) OR (va nang)) cong luan phan lap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - hanh trinh ((va hang) OR (va nang)) cong luan phan lap*.