Perhaps you should try some spelling variations:
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
kem ca » kem cd

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((nang xa) or (nang x)) hoi. hieu va cam tu va hanh kem ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (nang x)) hoi. hieu va cam tu va hanh kem ca tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (nang x)) hoi. hieu va cam tu va hanh kem ca tren*.