Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
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) or (hoc sach)) ky nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) han tai cua te~.
• 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 (tuc va)) han tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ky nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) han tai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) han tai cua te*.