Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky ((mang xa) or (nang ma)) hoi. hieu va cac thuc vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky ((mang xa) OR (nang ma)) hoi. hieu va cac thuc vat hanh vi cua te*.