Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam truc » nam truoc, nam thuc, nam trung
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
va nam » van nam, ha nam, va nay
vi cua » vai cua, di cua

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 (tu sach)) ky nang xa hoi. hieu va nam truc va hanh ((vi cua) or (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (tu sach)) ky nang xa hoi. hieu va nam truc va hanh ((vi cua) OR (hai cua)) te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (tu sach)) ky nang xa hoi. hieu va nam truc va hanh ((vi cua) or (hai cua)) te*.