Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang doi » nang doc, nang noi, hang doi
hieu van » hieu va, thien van, lieu va
doi cua » dai cua, hoi cua
xa nang » da nang, va nang, xa nong
cac tac » cac toc, cac bac, cac dac
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac cuoc
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: tu sach ky lang xa hoi. hieu van ((((cac tuc) or (cac nuoc))) or (cac tac)) xa nang doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu van ((((cac tuc) OR (cac nuoc))) OR (cac tac)) xa nang doi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu van ((((cac tuc) or (cac nuoc))) or (cac tac)) xa nang doi cua viet*.