Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
tham tuc » tham thuc, nham thuc, pham thuc
hoc sach » hoc sinh, hoc cac, hoc anh
thu nang » thi nang, thu hang, thu bang
dinh dai » dinh dat, sinh dai, dinh dao
thai tuc » thai thuc, thai thuy, thai hoc
dai cuu » dai cua, dai huu
xa dinh » xac dinh, va dinh, ba dinh
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
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) or (hoc sach)) thu nang ma hoi. lieu va ((tham tuc) or (thai tuc)) xa dinh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) thu nang ma hoi. lieu va ((tham tuc) OR (thai tuc)) xa dinh dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) thu nang ma hoi. lieu va ((tham tuc) or (thai tuc)) xa dinh dai cuu tre*.