Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
van cam » van lam, van cau, van dam
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) or (vu quang)) x hoi. hieu ((van cam) OR (van nam)) duc va thanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (vu quang)) x hoi. hieu ((van cam) OR (van nam)) duc va thanh va cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (vu quang)) x hoi. hieu ((van cam) OR (van nam)) duc va thanh va cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (vu quang)) x hoi. hieu ((van cam) OR (van nam)) duc va thanh va cua tu*.