Perhaps you should try some spelling variations:
phan hoan » phap hoan, phan hoa, pham hoang
mach hoc » cach hoc, dich hoc, anh hoc
cuu nang » chuc nang, cam nang, cuu van
nang hoc » nang doc, nang luc, dong hoc
hoc phan » hoc dan, hoc pho
hoan hoc » hoa hoc, toan hoc, hoang hoa
phat van » pham van, phan van, phap van
tu mach » tu cach, tu manh, tu hach
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi

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 hoc tap, nghien cuu nang hoc phan hoan hoc ((ma hoi) or (mai hoi)) va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu nang hoc phan hoan hoc ((ma hoi) OR (mai hoi)) va phat van.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu nang hoc phan hoan hoc ((ma hoi) or (mai hoi)) va phat van*.