Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cuc te » cua te, cuc thue, cuc tieu

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