Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang doi » nang doc, nang noi, hang doi
cac tac » cac toc, cac bac, cac dac
doi cua » dai cua, hoi cua
xa nang » da nang, va nang, xa nong
tu sach » thu sach, su sach, te sach
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
cac tuc » cac toc, cac tu, cac nuoc
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((hieu va) OR (hieu qua)) ((cac tuc) or (cac tac)) xa nang doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. ((hieu va) OR (hieu qua)) ((cac tuc) OR (cac tac)) xa nang doi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. ((hieu va) OR (hieu qua)) ((cac tuc) or (cac tac)) xa nang doi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. ((hieu va) OR (hieu qua)) ((cac tuc) or (cac tac)) xa nang doi cua viet*.