Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
moi quan » mai quan, hai quan
cham tu » pham tu, cam tu, chai tu
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
bai ky » ban ky, sai ky, bac ky
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 ve cham tu ban thanh ((moi quan) OR (co quan)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky ((nang xa) OR (sang ma)) hoi. hieu ve cham tu ban thanh ((moi quan) OR (co quan)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky ((nang xa) or (sang ma)) hoi. hieu ve cham tu ban thanh ((moi quan) OR (co quan)) viet".
• Adding a wildcard symbol may retrieve word variants: te bai ky ((nang xa) or (sang ma)) hoi. hieu ve cham tu ban thanh ((moi quan) OR (co quan)) viet*.