Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat hoc » chat hoa, chat thom, vat hoc
hanh vu » hanh vi, hanh va, hanh tu
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
anh vu » anh tu, anh va, anh ve

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 ty nang ((chat hoc) OR (cho hoc)). hieu va cac xuc van ((anh vu) or (hanh vu)) cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((chat hoc) OR (cho hoc)). hieu va cac xuc van ((anh vu) OR (hanh vu)) cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ((chat hoc) OR (cho hoc)). hieu va cac xuc van ((anh vu) or (hanh vu)) cua cau*".