Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
ban hanh » ban hang
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cuu ban » cuu van, cua ban, cuu san
bai cua » ban cua, bai ca, hai cua

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

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