Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
nang luan » tang luan, hang luan, nang quan
ho chieu » theo chieu, hoc thieu, mot chieu
anh nang » ganh nang, anh bang, anh dang
luan han » luan hoan, luan phan, luan van
cong tac » cong ty
toan cao » toan ban, toan tap

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 - anh nang luan han ((huong dan) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - anh nang luan han ((huong dan) OR (cong tac)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sach - anh nang luan han ((huong dan) or (cong tac)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sach - anh nang luan han ((huong dan) or (cong tac)) toan cao*.