Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
chat hoc » chat hoa, chat thom, cho hoc
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
van anh » van thanh, tuan anh, van minh
cua cau » cua cac, cua chu, cua cay
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) ((ty nang) or (ky nang)) chat hoc. hieu va cac xuc van anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ((ty nang) OR (ky nang)) chat hoc. hieu va cac xuc van anh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ((ty nang) or (ky nang)) chat hoc. hieu va cac xuc van anh vi cua cau*".