Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
tham tuc » tham thuc, nham thuc, pham thuc
dinh dai » dinh dat, sinh dai, dinh dao
thai tuc » thai thuc, thai thuy, thai hoc
thu nang » thi nang, thu hang, thu bang
hoc sach » hoc sinh, hoc cac, hoc anh
nang ma » tang ma, sang ma, nang cao
xa dinh » xac dinh, va dinh, ba dinh
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) OR (hoc sach)) thu nang ma hoi. lieu va ((tham tuc) or (thai tuc)) xa dinh dai cua 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 cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) thu nang ma hoi. lieu va ((tham tuc) or (thai tuc)) xa dinh dai cua 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 cua tre*.