Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
me hoi » le 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) OR (sach tu)) nang ((me hoi) or (xa hoi)). hieu van cac vuc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang ((me hoi) OR (xa hoi)). hieu van cac vuc van hanh thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang ((me hoi) or (xa hoi)). hieu van cac vuc van hanh thai cua tre*".