Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
dan cung » dan dung, dan vung, ban cung
cung hoc » chung hoc, dung hoc, vung hoc
tu manh » tu minh, vu manh, tung manh
tu hanh » du hanh, lu hanh, thuc hanh
va luan » vay luan, van luan, va quan
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu manh) or (tu hanh)) hoc tap, nghien cac cong hoa dan cung hoc ma hoi va luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu manh) OR (tu hanh)) hoc tap, nghien cac cong hoa dan cung hoc ma hoi va luan van.
• Adding a wildcard symbol may retrieve word variants: ((tu manh) or (tu hanh)) hoc tap, nghien cac cong hoa dan cung hoc ma hoi va luan van*.