Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
toc sai » toc san, toc dai, thuoc sai
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
ke cau » ket cau
va cau » van cau, va cac, va dau
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cau » ve cau, di cau, viet cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sai ky ((nang xa) OR (lang xa)) hoi. hieu ((ke cau) OR (va cau)) tao va dan vi cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sai ky ((nang xa) OR (lang xa)) hoi. hieu ((ke cau) or (va cau)) tao va dan vi cau treo~".
• Adding a wildcard symbol may retrieve word variants: toc sai ky ((nang xa) OR (lang xa)) hoi. hieu ((ke cau) or (va cau)) tao va dan vi cau treo*.