Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » lang xa, nang ma, ang xa
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cac nop » cac hop, cac lop, cac nuoc
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nop va » hop va
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: tu sac ky ((((nang xa) OR (mang xa))) or (nang x)) hoi. hieu va cac nop va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((((nang xa) OR (mang xa))) OR (nang x)) hoi. hieu va cac nop va hanh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((((nang xa) OR (mang xa))) or (nang x)) hoi. hieu va cac nop va hanh dai cua te*".