Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
soc van » hoc van, oc van, sac van
va chat » van chat, va phat, cao chat
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
va lang » va nang, hoa lang
ve chat » van chat
vi su » va su, ve su, ki su

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) OR (va chat)) soc van hanh vi su triet~.
• 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) OR (va chat)) soc van hanh vi su triet*.
• 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) OR (va chat)) soc van hanh vi su triet*".