Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
thanh va » hanh va, thanh ha, thanh ve
cac tac » cac toc, cac bac, cac dac
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
van cac » van hac, van cau, van bac
so hai » son hai, su hai, so ha
tac xa » tuc xa, tac da
o hai » co hai, o lai, _ hai

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 ((o hai) OR (so hai)). hieu van cac tac xa ((thanh va) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hai) OR (so hai)). hieu van cac tac xa ((thanh va) OR (thanh van)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((o hai) OR (so hai)). hieu van cac tac xa ((thanh va) or (thanh van)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o hai) OR (so hai)). hieu van cac tac xa ((thanh va) or (thanh van)) su triet*.