Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
hac xuc » chat xuc
van hac » van hoc, van ha, van hai
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 tre » cua te, cuu tre, cua triet
me hoi » le hoi
ma hoi » mai hoi, ma hoa, va hoi

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 ((((ma hoi) OR (me hoi))) or (xa hoi)). hieu van hac xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((((ma hoi) OR (me hoi))) OR (xa hoi)). hieu van hac xuc van hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((((ma hoi) OR (me hoi))) or (xa hoi)). hieu van hac xuc van hanh tai cua tre*".