Perhaps you should try some spelling variations:
ban hanh » ban hang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
ve giao » te giao, viet giao, van giao
duc ban » duc tan, duc van, dua ban
ky lang » ky nang, ky dang, ky tang
lap cua » lai cua, tap cua, lam cua
ha hoi » ha noi, xa hoi, va hoi
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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 ((ha hoi) or (hoa hoi)). hieu ve giao duc ban hanh ((lap cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ((ha hoi) OR (hoa hoi)). hieu ve giao duc ban hanh ((lap cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ((ha hoi) or (hoa hoi)). hieu ve giao duc ban hanh ((lap cua) or (dai cua)) triet*.