Perhaps you should try some spelling variations:
nguyen huu » nguyen duc
ngon nang » nguon nang, con nang, hon nang
mach hoc » cach hoc, dich hoc, anh hoc
sach doi » sach hoi, sach moi, sach dao
hoa ngon » hoa nguoi, nhom ngon, hoa thon
nang hoc » nang doc, nang luc, dong hoc
cac phan » cac nhan, cao phan, cap phan
phan van » pham van, thanh van, luan van
son hoa » so hoa, mon hoa, son ha
hoi cac » hoc cac, voi cac, hoa cac
hoc xa » hoc ma

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) or (sach doi)) tap, nguyen huu son hoa ngon nang hoc xa hoi cac phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (sach doi)) tap, nguyen huu son hoa ngon nang hoc xa hoi cac phan van.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (sach doi)) tap, nguyen huu son hoa ngon nang hoc xa hoi cac phan van*.