Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
y lang » o lang, _ lang, tay lang
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
tu may » tu ma, ty may, tu cay
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va cao
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y lang xa hoi. hieu ve cac tu may tinh ((vi cau) or (((va cau) OR (va dau)))) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu ve cac tu may tinh ((vi cau) OR (((va cau) OR (va dau)))) treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. hieu ve cac tu may tinh ((vi cau) or (((va cau) OR (va dau)))) treo*".