Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
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
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va luan » vay luan, van luan, va quan

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 hoc dan cung hoc mai hoi va luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu manh) OR (tu hanh)) hoc tap, nghien cac cong hoc dan cung hoc mai hoi va luan van".
• Adding a wildcard symbol may retrieve word variants: ((tu manh) OR (tu hanh)) hoc tap, nghien cac cong hoc dan cung hoc mai hoi va luan van*.