Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va triet » va thiet, va trien, ve triet
cong cua » cong cu, dong cua, huong cua
luc van » luoc van, luu van, duc van
vuc van » duc van, thuc van, chuc van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
song xa » song cua
dai va » mai va
ve cam » ve cham, ve cac, va cam

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 ky ((song xa) or (cong cua)) hoi. hieu ve cam ((vuc van) OR (luc van)) thanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((song xa) OR (cong cua)) hoi. hieu ve cam ((vuc van) OR (luc van)) thanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((song xa) or (cong cua)) hoi. hieu ve cam ((vuc van) OR (luc van)) thanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((song xa) or (cong cua)) hoi. hieu ve cam ((vuc van) OR (luc van)) thanh dai va triet*.