Perhaps you should try some spelling variations:
chat soc » cham soc, chat hoc, chat doc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
va lang » va nang, hoa lang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
soc van » hoc van, oc van, sac van
su tien » su hien, tu tieng, dau tien
kien » bien, vien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu bach)) va lang xa hoi. hieu ve chat soc van hanh vi ((su tien) OR (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) va lang xa hoi. hieu ve chat soc van hanh vi ((su tien) OR (su kien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) va lang xa hoi. hieu ve chat soc van hanh vi ((su tien) OR (su kien))*".