Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
sinh ky » sinh ly, sinh y, kinh ky
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ky lang xa hoi. hieu ve cac thuc ((va dinh) or (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ky lang xa hoi. hieu ve cac thuc ((va dinh) OR (va hanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sinh ky lang xa hoi. hieu ve cac thuc ((va dinh) or (va hanh)) dai cua tre*.