Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
s_ hai » su hai, so hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((_ hai) OR (s_ hai)). hieu va cham tuc va ((vanh dai) OR (vanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((_ hai) or (s_ hai)). hieu va cham tuc va ((vanh dai) OR (vanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((_ hai) or (s_ hai)). hieu va cham tuc va ((vanh dai) OR (vanh tai)) cua tre*.