Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh dau » dinh dat, dinh du, danh dau
thai tuc » thai thuc, thai thuy, thai hoc
tham tuc » tham thuc, nham thuc, pham thuc
thi van » thi lan, thi hanh, thi nang
va dinh » van dinh, va kinh, va tinh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 y nang ((ma hoi) OR (xa hoi)). thi van ((tham tuc) or (thai tuc)) va dinh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((ma hoi) OR (xa hoi)). thi van ((tham tuc) OR (thai tuc)) va dinh dau cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((ma hoi) OR (xa hoi)). thi van ((tham tuc) or (thai tuc)) va dinh dau cua tre*".