Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh via » hanh vi, hanh va, hanh ve
tai thuc » thai thuc, tri thuc, dai thuc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
anh va » hanh va
va tai » va tac, va tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((nang x) or (dang xay)) hoi. hieu va tai thuc va ((hanh via) OR (anh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang x) OR (dang xay)) hoi. hieu va tai thuc va ((hanh via) OR (anh va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((nang x) or (dang xay)) hoi. hieu va tai thuc va ((hanh via) OR (anh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang x) or (dang xay)) hoi. hieu va tai thuc va ((hanh via) OR (anh va)) cua triet*.