Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
phap luu » phap lua, phap luat, phap luan
van quan » van ban
van luan » van tuan, von luan, vay luan
ban cua » ban quan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve phap » va phap, de phap, ve phan

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 ((nang xa) OR (nang x)) hoi. hieu ve phap luu ((van luan) or (van quan)) ban cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu ve phap luu ((van luan) OR (van quan)) ban cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang x)) hoi. hieu ve phap luu ((van luan) or (van quan)) ban cua triet*".