Perhaps you should try some spelling variations:
ban hanh » ban hang
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ve chat » va chat, van chat
va hanh » van hanh, va thanh, va danh
su viet » so viet
y lang » o lang, _ lang, tay lang
ve cam » ve cham, ve cac, va cam
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 y lang xa hoi. hieu ((ve cam) or (ve chat)) xuc ((va hanh) or (ban hanh)) vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. hieu ((ve cam) OR (ve chat)) xuc ((va hanh) OR (ban hanh)) vi su viet.
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu ((ve cam) or (ve chat)) xuc ((va hanh) or (ban hanh)) vi su viet*.