Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
trinh vat » trinh van, trinh luat, sinh vat
dang xay » dang van, van xay
coc tuc » coc luc, hoc thuc, doc thuc
tinh va » tich va, trinh van, tinh gia
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
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: vu sach ky dang xay hoi. ((hieu ve) or (hieu va)) coc tuc xa ((tinh va) OR (trinh vat)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xay hoi. ((hieu ve) OR (hieu va)) coc tuc xa ((tinh va) OR (trinh vat)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang xay hoi. ((hieu ve) or (hieu va)) coc tuc xa ((tinh va) OR (trinh vat)) cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xay hoi. ((hieu ve) or (hieu va)) coc tuc xa ((tinh va) OR (trinh vat)) cua triet*.