Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
thuc day » thuc dan, thuc vat
lam thuc » lam thuoc, am thuc, nam thuc
hai cua » thai cua, dai cua, hoi cua
dan hai » doan hai, dang hai, dan khai
day dan » day danh, dao dan, cay dan
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
va lam » van lam, va lap
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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) OR (thu sach)) ty nang ((x hoi) or (o hoi)). hieu va lam thuc day dan hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ((x hoi) OR (o hoi)). hieu va lam thuc day dan hai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ((x hoi) or (o hoi)). hieu va lam thuc day dan hai cua triet*".