Perhaps you should try some spelling variations:
giang cua » gian cua, giang qua, giang xua
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va manh » van manh, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
bai so » dai so, tai so, hai so
so va » so van, so vat, su va

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 ky ((nang ma) or (tang ma)) hoi. hieu va bai so va manh giang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((nang ma) OR (tang ma)) hoi. hieu va bai so va manh giang cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((nang ma) or (tang ma)) hoi. hieu va bai so va manh giang cua tre*.