Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hoc sach » hoc sinh, hoc cac, hoc anh
va doanh » van doanh, vay doanh, va danh
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
va dan » ca dan, va dao, va dau
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu vu pham thuc ((va doanh) OR (va dan)) day ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu vu pham thuc ((va doanh) or (va dan)) day ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu vu pham thuc ((va doanh) or (va dan)) day ((cua tre) OR (cua te))*.