Perhaps you should try some spelling variations:
su cach » su sach, tu cach, su cac
cach tu » cach thuc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cach tu ((nang x) or (nang cao)) hoi. hieu ve pham duc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach tu ((nang x) OR (nang cao)) hoi. hieu ve pham duc va tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su cach tu ((nang x) or (nang cao)) hoi. hieu ve pham duc va tinh di cua tre*.