Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh tai » thanh tai, hang tai, han tai
danh xay » dang xay, manh xay, anh xay
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, cac nuoc, cac cuoc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ky danh xay hoi. hieu ve ((cac luc) OR (coc luc)) va hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky danh xay hoi. hieu ve ((cac luc) OR (coc luc)) va hanh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky danh xay hoi. hieu ve ((cac luc) OR (coc luc)) va hanh tai cuc tre*".