Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang x)) hoi. hieu ve cam duc va hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu ve cam duc va hanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu ve cam duc va hanh vi ((cua tre) or (cau treo))*.