Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham hoi » cham voi, cham h'roi, pham hoai
thanh vi » hanh vi, thanh va, thanh ve
chat hoc » chat hoa, chat thom, cho hoc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu su » hieu sau, tieu su, hieu so
xang xa » lang xa, mang xa, ang xa
cuu tre » cua tre, cau tren, cau treo
y xang » ty xang
vi cuu » vi luu, vinh cuu

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 y xang xa hoi. ((hieu va) or (hieu su)) ((cham hoi) or (chat hoc)) van thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y xang xa hoi. ((hieu va) OR (hieu su)) ((cham hoi) OR (chat hoc)) van thanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y xang xa hoi. ((hieu va) or (hieu su)) ((cham hoi) or (chat hoc)) van thanh vi cuu tre*.