Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
hieu va » lieu va, hieu qua

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 ty dang xay hoi. ((hieu ve) or (hieu va)) cam xuc van hanh lai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang xay hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh lai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty dang xay hoi. ((hieu ve) or (hieu va)) cam xuc van hanh lai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang xay hoi. ((hieu ve) or (hieu va)) cam xuc van hanh lai ((cua tre) OR (cua triet))*.