Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cuu tre » cua tre, cau tren
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
lang ha » long ha
hieu va » lieu va, hieu qua
cac ty » cac ky, cac tu
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: hoc cac ty ((nang xa) or (lang ha)) hoi. hieu va cac tuc va hanh vi ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ty ((nang xa) OR (lang ha)) hoi. hieu va cac tuc va hanh vi ((cuu tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: hoc cac ty ((nang xa) or (lang ha)) hoi. hieu va cac tuc va hanh vi ((cuu tre) or (cau treo))*.