Perhaps you should try some spelling variations:
ban hanh » ban hang
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
ve pham » v pham, ve phan, ve phat
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, hoi cua, lai cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang xa hoi. hieu ((ve pham) or (vi pham)) duc ban hanh ((hai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. hieu ((ve pham) OR (vi pham)) duc ban hanh ((hai cua) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang xa hoi. hieu ((ve pham) or (vi pham)) duc ban hanh ((hai cua) OR (dai cua)) tre*".