Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
tham tuc » tham thuc, thai tuc, nham thuc
danh dai » danh dau, danh di, danh sai
nang ma » tang ma, sang ma, nang cao
va tham » van tham, va cham, va thanh
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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 (doc sach)) y nang ma hoi. lieu va tham tuc va danh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang ma hoi. lieu va tham tuc va danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y nang ma hoi. lieu va tham tuc va danh dai cua tre*.