Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va
thuc ca » thuc cua, thuc can, thuc cao
dan lap » phan lap, dan luan
lap cua » lai cua, tap cua, lam cua
ca dan » cac dan, ca dao

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)) nam thuc ca dan lap 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)) nam thuc ca dan lap cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. ((hieu ve) or (hieu van)) nam thuc ca dan lap cua triet*.