Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
nhanh hoa » nhanh hoan, thanh hoa, khanh hoa
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi tai » hoi tai, dai tai, moi tai
doi tac » dong tac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((doi tai) or (doi tac)), nghien cuu mon hoc nhanh hoa hoc mai hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((doi tai) OR (doi tac)), nghien cuu mon hoc nhanh hoa hoc mai hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach ((doi tai) or (doi tac)), nghien cuu mon hoc nhanh hoa hoc mai hoi va nhan dan*.