Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
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
cua tre » cua te, cuu tre, cua triet
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
ma hoi » mai hoi, ma hoa, me 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) OR (ty hang)) ((ma 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) OR (ty hang)) ((ma 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) OR (ty hang)) ((ma hoi) or (xa hoi)). hieu van hac xuc van hanh tai cua tre*".