Perhaps you should try some spelling variations:
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac lap » cac lop, cac cap, cac tap
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
te cac » tu cac, ve cac, te cao
lap va » tap va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang xa) OR (lang xa)) hoi. hieu va cac lap va hanh ((vai cua) OR (dai cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((nang xa) or (lang xa)) hoi. hieu va cac lap va hanh ((vai cua) OR (dai cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang xa) or (lang xa)) hoi. hieu va cac lap va hanh ((vai cua) OR (dai cua)) tu*.