Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, anh thai
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
xuc van » duc van, luc van, vuc van
hac xuc » chat xuc
van hac » van hoc, van ha, van hai
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
ky van » ly van, ty van
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky van) OR (ky va)) xay hoi. thien van hac xuc van ((hanh thai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky van) OR (ky va)) xay hoi. thien van hac xuc van ((hanh thai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky van) OR (ky va)) xay hoi. thien van hac xuc van ((hanh thai) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky van) OR (ky va)) xay hoi. thien van hac xuc van ((hanh thai) or (hanh tai)) cua tre*.