Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
nang xa » nang x, lang xa, nang ma
luu tre » luu tru, luy tre
xuc van » duc van, luc van, vuc van
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vien cac ky ((nang xa) or (tang ma)) hoi. hieu va chat xuc van hanh vi ((luu tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vien cac ky ((nang xa) OR (tang ma)) hoi. hieu va chat xuc van hanh vi ((luu tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vien cac ky ((nang xa) or (tang ma)) hoi. hieu va chat xuc van hanh vi ((luu tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vien cac ky ((nang xa) or (tang ma)) hoi. hieu va chat xuc van hanh vi ((luu tre) OR (cuu tre))*.