Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cham duc » cham soc, pham duy, phan duc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
lai cua » hai cua, lai chau, thai cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu van ((cham duc) OR (pham duc)) va hanh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van ((cham duc) OR (pham duc)) va hanh ((lai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu van ((cham duc) OR (pham duc)) va hanh ((lai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van ((cham duc) OR (pham duc)) va hanh ((lai cua) or (dai cua)) tre*.