Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
ve triet » va trien, su triet
gian ve » gian viet
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
sang ma » tang ma, nang ma, sang tao
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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 tu ((lang xa) or (sang ma)) hoi. hieu ve cac ((luc va) OR (tuc va)) thanh gian ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((lang xa) OR (sang ma)) hoi. hieu ve cac ((luc va) OR (tuc va)) thanh gian ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((lang xa) or (sang ma)) hoi. hieu ve cac ((luc va) OR (tuc va)) thanh gian ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((lang xa) or (sang ma)) hoi. hieu ve cac ((luc va) OR (tuc va)) thanh gian ve triet*.