Perhaps you should try some spelling variations:
thien van » thi van
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » pham thuc, tham thuc, cham soc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va si » va sli, va su, va vi

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 xa hoi. thien van ((cham tuc) or (nham thuc)) va si dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien van ((cham tuc) OR (nham thuc)) va si dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van ((cham tuc) or (nham thuc)) va si dai cua tre*.