Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
so sanh » do sanh
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
sanh y » sinh y, anh y, hanh y
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: so sanh y ((nang x) or (tang ma)) hoi. lieu va cac thuc ((va dinh) or (va tinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang x) OR (tang ma)) hoi. lieu va cac thuc ((va dinh) OR (va tinh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang x) or (tang ma)) hoi. lieu va cac thuc ((va dinh) or (va tinh)) di cua tre*.