Perhaps you should try some spelling variations:
ban hanh » ban hang
va trien » va truyen, va tuyen, va tieng
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
nam xua » nam cua, nam mua, nam qua
xua ban » xuat ban, cua ban, qua ban
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xa hoi. ((hieu ve) or (lieu va)) nam xua ban hanh ve ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. ((hieu ve) OR (lieu va)) nam xua ban hanh ve ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang xa hoi. ((hieu ve) or (lieu va)) nam xua ban hanh ve ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xa hoi. ((hieu ve) or (lieu va)) nam xua ban hanh ve ((va trien) OR (va thiet))*.