Perhaps you should try some spelling variations:
cai tren » cai tien, ca tren, cau tren
caim luc » cau luc
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va caim » va cam, va chim
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tu ban » thu ban, te ban
luc va » duc va, tuc va, loc va
va cai » va cac, va bai, va dai
tu dan » tuc dan, cu dan, tu can

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) OR (tu ban)) ky ((nang xa) or (nang x)) hoi. hieu va caim luc va hanh va cai tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu dan) OR (tu ban)) ky ((nang xa) OR (nang x)) hoi. hieu va caim luc va hanh va cai tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu dan) OR (tu ban)) ky ((nang xa) or (nang x)) hoi. hieu va caim luc va hanh va cai tren".
• Adding a wildcard symbol may retrieve word variants: ((tu dan) OR (tu ban)) ky ((nang xa) or (nang x)) hoi. hieu va caim luc va hanh va cai tren*.