Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sai ky » sac ky
ve cac » va cac, vien cac
cac co » cac cong
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sai ky)) nang x hoi. hieu ve cac co ban hanh hai ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) nang x hoi. hieu ve cac co ban hanh hai ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sai ky)) nang x hoi. hieu ve cac co ban hanh hai ((cua te) OR (cua tu))*".