Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dong doi » duong doi, dung doi, dong hoi
nong doi » vong doi, nong do, mong doi
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
su sach » so sach, vu sach
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu ve ((cac tuc) OR (cac tac)) xa ((nong doi) or (dong doi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ve ((cac tuc) OR (cac tac)) xa ((nong doi) OR (dong doi)) cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ve ((cac tuc) OR (cac tac)) xa ((nong doi) or (dong doi)) cua viet*".