Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
sinh dai » sinh thai, si dai, sinh vat
dinh dai » dinh dat, dinh dao, dinh tai
van cham » van chat, van tham, va cham
thi van » thi lan, thi hanh, thi nang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
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 (thuoc sach)) ky nang xa hoi. thi van cham tuc va ((dinh dai) OR (sinh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky nang xa hoi. thi van cham tuc va ((dinh dai) OR (sinh dai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) ky nang xa hoi. thi van cham tuc va ((dinh dai) OR (sinh dai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ky nang xa hoi. thi van cham tuc va ((dinh dai) OR (sinh dai)) cua tre*.