Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, danh va, doanh van
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
vai cua » dai cua, hai cua, lai cua
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
ty nang » ky nang, ty xang, ty hang
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang o hai. ((hieu va) OR (lieu va)) am ((thuc va) OR (thuc day)) danh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang o hai. ((hieu va) OR (lieu va)) am ((thuc va) or (thuc day)) danh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang o hai. ((hieu va) OR (lieu va)) am ((thuc va) or (thuc day)) danh vai cua triet*.