Perhaps you should try some spelling variations:
ban thai » ban than, ban thi, ban tai
va thieu » va thiet, va hieu, va tieu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
thai va » thai van

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) or (cac ky)) nang xa hoi. hieu ve chat ((xuc van) OR (luc van)) ban thai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (cac ky)) nang xa hoi. hieu ve chat ((xuc van) OR (luc van)) ban thai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (cac ky)) nang xa hoi. hieu ve chat ((xuc van) OR (luc van)) ban thai va thieu".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (cac ky)) nang xa hoi. hieu ve chat ((xuc van) OR (luc van)) ban thai va thieu*.