Perhaps you should try some spelling variations:
tinh son » tinh toan, dinh so, tinh hoc
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
hieu va » lieu va, hieu qua
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
son va » song va, son la, lon va
te san » te ban, ke san, tu san

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

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