Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
qua cham » qua hai, qua cac, va cham
ty nang » ky nang, ty hang, ly nang
dan dat » dung dat, dong dat, dinh dat
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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) OR (ty xang)) x hoi. hieu qua cham tuc va ((can dai) or (dan dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ty xang)) x hoi. hieu qua cham tuc va ((can dai) OR (dan dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) OR (ty xang)) x hoi. hieu qua cham tuc va ((can dai) or (dan dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) OR (ty xang)) x hoi. hieu qua cham tuc va ((can dai) or (dan dat)) cua tre*.