Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
han tai » hang tai, nhan tai, van tai
tai cua » thai cua, tai cuc, tri cua
va han » va phan, van han, va hanh
cua te » cua tu
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) or (((hoc sach) or (hoc sinh)))) ky nang x hoi. hieu van cam truc va han tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (((hoc sach) OR (hoc sinh)))) ky nang x hoi. hieu van cam truc va han tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (((hoc sach) or (hoc sinh)))) ky nang x hoi. hieu van cam truc va han tai cua te*.