Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thanh va » hanh va, thanh ha, thanh ve
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
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 (ty xang)) x hoi. hieu van pham duc va ((thanh va) or (thanh van)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) x hoi. hieu van pham duc va ((thanh va) OR (thanh van)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) x hoi. hieu van pham duc va ((thanh va) or (thanh van)) cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) x hoi. hieu van pham duc va ((thanh va) or (thanh van)) cua tu*.