Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
dan lai » dan loai, dan lap, dan lat
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
ky lang » ky dang, ky tang, tay lang
tuc va » thuc va, truc va, tuc xa
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. ((hieu ve) OR (hieu van)) cam tuc va dan lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. ((hieu ve) OR (hieu van)) cam tuc va dan lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky nang)) xa hoi. ((hieu ve) OR (hieu van)) cam tuc va dan lai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. ((hieu ve) OR (hieu van)) cam tuc va dan lai cua triet*.