Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
cham tuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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) or (doc sach)) ky sang ma hoi. ((hieu ve) or (hieu van)) cham tuc va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (doc sach)) ky sang ma hoi. ((hieu ve) OR (hieu van)) cham tuc va thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (doc sach)) ky sang ma hoi. ((hieu ve) or (hieu van)) cham tuc va thanh di cua tre*.