Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
hoc sach » hoc sinh, hoc cac, hoc anh
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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)) ky nang xa hoi. hieu van cam ((xuc va) or (truc va)) han tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang xa hoi. hieu van cam ((xuc va) OR (truc va)) han tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang xa hoi. hieu van cam ((xuc va) or (truc va)) han tai cua tu*.