Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
danh doi » danh di, thanh doi, dung doi
toc sach » doc sach, thuoc sach, nuoc sach
nang co » nang cao, nang doc, nang noi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
nang o » nang ho, nang ro, nang x
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (toc sach)) van ((nang o) or (nang co)) hoc. hieu va cam tuc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (toc sach)) van ((nang o) OR (nang co)) hoc. hieu va cam tuc va danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (toc sach)) van ((nang o) or (nang co)) hoc. hieu va cam tuc va danh doi cua tre*.