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