Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
toc sach » hoc sach, doc sach, thuoc sach
nang doi » nang doc, nang noi, hang doi
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
cac toc » cac toi, cac nuoc, cac thoi
doi cua » dai cua, hoi cua
xa nang » da nang, va nang, xa nong
cac tuc » cac tu, cac tac, cac nuoc
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) y nang van hoa. hieu van ((cac tuc) or (cac toc)) xa nang doi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang van hoa. hieu van ((cac tuc) OR (cac toc)) xa nang doi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang van hoa. hieu van ((cac tuc) or (cac toc)) xa nang doi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang van hoa. hieu van ((cac tuc) or (cac toc)) xa nang doi cua viet*.