Perhaps you should try some spelling variations:
thai thuc » thai thuy, tham thuc, thi thuc
thai tuc » thai thuy, thai hoc, thu tuc
dinh dai » dinh dat, sinh dai, dinh dao
sach thu » sach thue, sach thieu, sach tham
va dinh » van dinh, va kinh, va tinh
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach thu)) nang ma hoi. lieu va ((thai tuc) OR (thai thuc)) va dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang ma hoi. lieu va ((thai tuc) OR (thai thuc)) va dinh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach thu)) nang ma hoi. lieu va ((thai tuc) OR (thai thuc)) va dinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) nang ma hoi. lieu va ((thai tuc) OR (thai thuc)) va dinh dai cua tre*.