Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
tham loc » tham nuoc, cham soc, hau loc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach vu » sach va, sach tu, sach uu
tao hoi » tao khoi, tao boi, tay hoi
sach xa » sach dao, sach nha, sach bai
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach vu) or (sach xa)) nang ((tao hoi) or (cau hoi)). hieu van tham loc va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vu) OR (sach xa)) nang ((tao hoi) OR (cau hoi)). hieu van tham loc va thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach vu) or (sach xa)) nang ((tao hoi) or (cau hoi)). hieu van tham loc va thanh tai cua tre*.