Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh tri » dinh tri, minh tri, chinh tri
va tinh » may tinh
nam duc » nam duoc, pham duc, nam thuc
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
va nam » van nam, ha nam, va nay
te bai » te bao, te tai, te ban
te sai » te tai, te lai, te hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sai) OR (te bai)) ky ((nang ma) OR (tang ma)) hoi. hieu va nam duc va tinh tri cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sai) or (te bai)) ky ((nang ma) OR (tang ma)) hoi. hieu va nam duc va tinh tri cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((te sai) or (te bai)) ky ((nang ma) OR (tang ma)) hoi. hieu va nam duc va tinh tri cua triet*.