Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
van hoi » van hoc, van hoe, van loi
hieu ve » hieu va, hieu van
cam cua » ca cua, nam cua, cau cua
y tang » ky tang, 6 tang, 7 tang
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: su sach y tang ((van hoi) OR (van hoa)). hieu ve cam cua ban thanh vai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y tang ((van hoi) OR (van hoa)). hieu ve cam cua ban thanh vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y tang ((van hoi) OR (van hoa)). hieu ve cam cua ban thanh vai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y tang ((van hoi) OR (van hoa)). hieu ve cam cua ban thanh vai ((cua triet) or (va triet))*.