Perhaps you should try some spelling variations:
te sach » toc sach
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky tang) or (ky nang)) ma hoi. hieu va cac duc va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) ma hoi. hieu va cac duc va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky nang)) ma hoi. hieu va cac duc va hanh vi ((cua tre) or (cuu tre))*.