Perhaps you should try some spelling variations:
cai tren » cai tien, ca tren, cau tren
caim luc » cau luc
lang xa » lang ha, dang xay, lang van
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
hieu va » lieu va, hieu qua
ve cai » va cai, ve cac, ve tai
luc va » duc va, tuc va, loc va
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky

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