Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
phan cung » phan cong, phan ung, phan xuong
cong hoa » dong hoa, dong hoc, hang hoa
hoa phan » hoa dan, co phan
cung hoc » chung hoc, dung hoc, vung hoc
tu manh » tu minh, tu hanh, vu manh
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va pham » van pham, va phat, va phap
ho tap » hoc tap, ho tai, ho tam
ho hap » hoi nhap, hoc phap

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 ((ho tap) or (ho hap)), nghien cua cong hoa phan cung hoc mai hoi va pham van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu manh ((ho tap) OR (ho hap)), nghien cua cong hoa phan cung hoc mai hoi va pham van.
• Adding a wildcard symbol may retrieve word variants: tu manh ((ho tap) or (ho hap)), nghien cua cong hoa phan cung hoc mai hoi va pham van*.