Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
cac dac » cac dan, cac dai, cac bac
dan vai » dan va, dan tai, dan vat
dac va » duc va, day va, dat va
va dan » ca dan, va dao, va dau

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