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
thai cua » than cua, tai cuc, dai cua
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, va hanh
xuc va » duc va, tuc va, luc va

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 danh ((thai cua) OR (tri 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 danh ((thai cua) OR (tri 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 danh ((thai cua) OR (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang xa hoi. hieu van cam xuc va danh ((thai cua) OR (tri cua)) te*.