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 ve » hieu va, hieu van
ve caim » ve chim
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
tu ban » thu ban, te ban
luc va » duc va, tuc va, loc va
ve cai » va cai, ve cac, ve tai
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 ve caim luc va hanh ve 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 ve caim luc va hanh ve 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 ve caim luc va hanh ve cai tren".
• Adding a wildcard symbol may retrieve word variants: ((tu dan) OR (tu ban)) ky ((nang xa) or (nang x)) hoi. hieu ve caim luc va hanh ve cai tren*.