Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
cach tu » cach thuc
va hanh » van hanh, va thanh, va danh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
tu cach » tu cac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu ((nang xa) OR (nang ma)) hoi. hieu va pham duc va hanh hai ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu ((nang xa) or (nang ma)) hoi. hieu va pham duc va hanh hai ((cua te) OR (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: tu cach tu ((nang xa) or (nang ma)) hoi. hieu va pham duc va hanh hai ((cua te) OR (cua tu))*.