Perhaps you should try some spelling variations:
nghien chuc » nghien cuu, nghiem thuc, nghiep thuc
nhanh hoan » thanh hoang, thanh hoa, khanh hoa
hoc nhanh » hoc nganh, hoc phan
nang hoc » nang doc, nang luc, dong hoc
hoan hoc » hoa hoc, toan hoc, hoang hoa
phan van » pham van, thanh van, luan van
tu mach » tu cach, tu hach, tu sach
tu manh » tu minh, tu hanh, vu manh
va phan » van phan, va phat, va phap
hoa va » hoa van, hoa xa, hoa vo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu mach) or (tu manh)) hoc tap, nghien chuc nang hoc nhanh hoan hoc ma hoa va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu mach) OR (tu manh)) hoc tap, nghien chuc nang hoc nhanh hoan hoc ma hoa va phan van.
• Adding a wildcard symbol may retrieve word variants: ((tu mach) or (tu manh)) hoc tap, nghien chuc nang hoc nhanh hoan hoc ma hoa va phan van*.