Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van chat
tham tuc » tham thuc, thai tuc, nham thuc
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
dan di » danh di, dan da, dan de
va dan » ca dan, va dao, va dau

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