Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
kho tang » cao tang
hanh tai » thanh tai, hang tai, han tai
ky trong » ly trong, ke trong, cay trong
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
ky tang » ky nang, ky dang, tay tang
tai cua » thai cua, tai cuc, tri cua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ((((ky tang) or (ky trong))) or (kho tang)) xa hoi. hieu va cam tuc va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((((ky tang) OR (ky trong))) OR (kho tang)) xa hoi. hieu va cam tuc va hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((((ky tang) or (ky trong))) or (kho tang)) xa hoi. hieu va cam tuc va hanh tai cua te*.