Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
cac bo » bac bo, cac co
bo va » bao va, do va, so va

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 ty nang xa hoi. ((hieu ve) OR (hieu va)) cac bo va hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cac bo va hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cac bo va hanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cac bo va hanh ((vai cua) or (dai cua)) tre*.