Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chat thuc » thuat thuc, nhan thuc, chat thai
thuc van » thuc vat, thuc dan, thuc va
thanh de » hanh de, thanh ve, thanh do
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ha » dong ha, dung ha, lang ha
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky dang ha hoi. ((hieu vu) or (hieu qua)) chat thuc van thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang ha hoi. ((hieu vu) OR (hieu qua)) chat thuc van thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky dang ha hoi. ((hieu vu) or (hieu qua)) chat thuc van thanh de cua tre*.