Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang dien » quang dien, dang dieu, nhan dien
than luc » nhan luc, than duc, thanh luu
tham luc » tham nuoc, tham thuc, nhan luc
cua tre » cua te, cuu tre, dua tren
va hang » van hang, va nang, va lang
co sach » bo sach, cuon sach, hoc sach
sach vu » sach va, sach tu, sach uu
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang dien ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach vu nang xa hoi. lieu va ((tham luc) OR (than luc)) va hang dien ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang dien ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: co sach vu nang xa hoi. lieu va ((tham luc) or (than luc)) va hang dien ((cua tre) OR (cua triet))*.