Perhaps you should try some spelling variations:
hoc anh » hoc nganh, hoc nhanh, ngoc anh
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
anh ky » hanh ky, anh y, anh my
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc anh ky nang x ho. hieu va cam duc va hanh vi ((cua tre) or (((cuu tre) or (cau thi))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc anh ky nang x ho. hieu va cam duc va hanh vi ((cua tre) OR (((cuu tre) OR (cau thi)))).
• Adding a wildcard symbol may retrieve word variants: hoc anh ky nang x ho. hieu va cam duc va hanh vi ((cua tre) or (((cuu tre) or (cau thi))))*.