Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
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
lap va » tap va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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: tu cac ky ((nang xa) OR (lang xa)) hoi. hieu va cac lap va hanh vai ((cua tu) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) or (lang xa)) hoi. hieu va cac lap va hanh vai ((cua tu) OR (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (lang xa)) hoi. hieu va cac lap va hanh vai ((cua tu) OR (cua cu))*.