Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
hang vi » hang va, hanh vi, hang di
nang vi » nang ji, nang si, nang va
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
v nang » va nang, vu nang, voi nang
cua tu » cua tuc, cua su, cua cu

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 ((v nang) OR (van nang)) xa hoi. hieu va cau luc va ((nang vi) or (hang vi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((v nang) OR (van nang)) xa hoi. hieu va cau luc va ((nang vi) OR (hang vi)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((v nang) OR (van nang)) xa hoi. hieu va cau luc va ((nang vi) or (hang vi)) cua tu".
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) OR (van nang)) xa hoi. hieu va cau luc va ((nang vi) or (hang vi)) cua tu*.