Perhaps you should try some spelling variations:
kham thuc » nham thuc, pham thuc, tham thuc
va doanh » van doanh, vay doanh, va danh
hoc sach » hoc sinh, hoc cac
nang xa » nang x, lang xa, nang ma
hoc anh » hoc nganh, hoc nhanh, ngoc anh
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
day cua » dai cua
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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) OR (hoc anh)) ky nang xa hoi. hieu vu kham thuc ((va doanh) OR (va dan)) day cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) ky nang xa hoi. hieu vu kham thuc ((va doanh) or (va dan)) day cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) ky nang xa hoi. hieu vu kham thuc ((va doanh) or (va dan)) day cua tre*.