Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh dai » hanh tai, hanh dao, vanh dai
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
sach thu » sach thue, sach thieu, sach tham
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
nam tuc » nam truc, nam tu, nam thuoc

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 thu) or (sach y)) dang cay phoi. hieu van ((nam tuc) OR (nam thuc)) xa hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach y)) dang cay phoi. hieu van ((nam tuc) OR (nam thuc)) xa hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach y)) dang cay phoi. hieu van ((nam tuc) OR (nam thuc)) xa hanh dai cua tre*".