Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
doi cua » dai cua, hoi cua
moi cua » hoi cua, moi quan, cuoi cua
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
bai ky » ban ky, sai ky, bac ky
cac tu » cac thu, cach tu, cac du
tu ban » thu ban, te ban
te bai » te bao, te tai, te ban

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

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