Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
ma hoi » mai hoi, xa hoi, ma hoa
cua cu » cua chu, cua cau, cua co
cua su » qua su

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: ((toc sach) OR (thuoc sach)) ty nang ma hoi. hieu va cac xuc van hanh vi ((cua cu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) ty nang ma hoi. hieu va cac xuc van hanh vi ((cua cu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ty nang ma hoi. hieu va cac xuc van hanh vi ((cua cu) OR (cua su))*.