Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van
tai thuc » thai thuc, tri thuc, dai thuc
hanh via » hanh vi, hanh va, anh va
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
via cua » gia cua, gian cua, giau cua
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: tu sach y ((nang x) or (((dang xay) OR (van xay)))) hoi. hieu va tai thuc va hanh via cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang x) OR (((dang xay) OR (van xay)))) hoi. hieu va tai thuc va hanh via cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang x) or (((dang xay) OR (van xay)))) hoi. hieu va tai thuc va hanh via cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (((dang xay) OR (van xay)))) hoi. hieu va tai thuc va hanh via cua triet*.