Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hoc sach » hoc sinh, hoc cac, hoc anh
chat tai » cao tai, khau tai, han tai
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
tu tham » tru tham, tu cham, tu kham
hieu tu » chieu tu, hieu tuc, hien tu
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
thai » thi, hai, than

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 tu tham thuc ((va hanh) OR (va dan)) lam ((chat tai) OR (chat thai))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu tu tham thuc ((va hanh) or (va dan)) lam ((chat tai) OR (chat thai))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu tu tham thuc ((va hanh) or (va dan)) lam ((chat tai) OR (chat thai))*.