Perhaps you should try some spelling variations:
quan triet » quan tri, quan viet, quan tren
ban thanh » ban hang
ban hanh » ban hang
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay
sang ma » tang ma, nang ma, sang tao
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((mang xa) or (sang ma)) hoi. hieu va cam tuc ((ban thanh) OR (ban hanh)) co quan triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((mang xa) OR (sang ma)) hoi. hieu va cam tuc ((ban thanh) OR (ban hanh)) co quan triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((mang xa) or (sang ma)) hoi. hieu va cam tuc ((ban thanh) OR (ban hanh)) co quan triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((mang xa) or (sang ma)) hoi. hieu va cam tuc ((ban thanh) OR (ban hanh)) co quan triet*.