Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
ky tang » ky dang, kho tang, ky trong
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
du va » dau va, tu va, su va

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 ve cac du va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky nang)) ma hoi. hieu ve cac du va hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky nang)) ma hoi. hieu ve cac du va hanh vi ((cua tre) or (cau tren))*.