Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
cham tuc » nham thuc, pham thuc, tham thuc
dat cua » dai cua, day cua, mat cua
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
thi van » thi lan, thi hanh, thi nang
sach ky » sac ky, sach y, sach ty
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, ma hoa, me hoi

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