Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
vi cau » va cau, ve cau, di cau
tu can » tu ban, tu cac, thu canh
tuc va » thuc va, tuc xa, duc va
can ky » van ky, dan ky, ban 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 can ky nang xa hoi. ((hieu ve) or (hieu va)) cam ((tuc va) or (truc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((tuc va) OR (truc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu can ky nang xa hoi. ((hieu ve) or (hieu va)) cam ((tuc va) or (truc va)) hanh vi cau tren*.