Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, doc sach, thuoc sach
thai tuc » thai thuc, thai thuy, thai hoc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
xa dinh » va dinh, ba dinh, ha 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.

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