Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh va » tich va, trinh van, trinh vat
xa tinh » va tinh, ha tinh, ca tinh
coc tuc » coc luc, hoc thuc, doc thuc
hieu va » lieu va, hieu qua
vu sach » su sach, vu khach
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cua » va chua, via cua, ca cua

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) OR (vu bach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc xa tinh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) ky lang xa hoi. ((hieu ve) OR (hieu va)) coc tuc xa tinh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc xa tinh va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu bach)) ky lang xa hoi. ((hieu ve) or (hieu va)) coc tuc xa tinh va cua triet*.