Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tam thuc » tham thuc, am thuc, nam thuc
lam chat » luan chat, cao chat, ly chat
van hanh » van thanh, ban hanh, van anh
chat tre » chay tren, chat tai, cho tre
hieu tu » chieu tu, hieu tuc, hien tu
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va hanh, dia danh
nang xa » nang x, lang xa, nang ma
tu tam » tu tham, tu tai, tp tam
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 ky nang xa hoi. hieu tu tam thuc ((van hanh) OR (((va danh) OR (va dan)))) lam chat tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu tu tam thuc ((van hanh) or (((va danh) OR (va dan)))) lam chat tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu tu tam thuc ((van hanh) or (((va danh) OR (va dan)))) lam chat tre*.