Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
kem cau » ket cau, ke cau, kem chu
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
tuc va » thuc va, truc va, tuc xa

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 ((nang xa) or (nang x)) hoi. ((hieu va) or (hieu qua)) cam tuc va hanh kem cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (nang x)) hoi. ((hieu va) OR (hieu qua)) cam tuc va hanh kem cau tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (nang x)) hoi. ((hieu va) or (hieu qua)) cam tuc va hanh kem cau tren*.