Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
tang dai » tang tai, tang dan, lang dai
luc ban » duc ban, cuc ban, luc bat
su sach » so sach
dai hoi » dai hoc, dai hai, dai moi
vu sach » vu bach, vu khach
ve cac » va cac, vien cac
y tang » ky tang, 6 tang, 7 tang
vi cua » vai cua, di cua
ve cam » ve cham, va cam, ve cai

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) or (vu sach)) y tang dai hoi. hieu ((ve cam) OR (ve cac)) luc ban thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y tang dai hoi. hieu ((ve cam) OR (ve cac)) luc ban thanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y tang dai hoi. hieu ((ve cam) OR (ve cac)) luc ban thanh vi cua triet*".