Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
tang mai » tang ma, tang tai, lang mai
cam luc » cam xuc, cau luc
luc ban » duc ban, cuc ban, luc bat
su sach » so sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
vu sach » vu bach, vu khach
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) or (vu sach)) y tang mai hoi. hieu ve cam luc ban thanh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y tang mai hoi. hieu ve cam luc ban thanh vi ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y tang mai hoi. hieu ve cam luc ban thanh vi ((cua triet) OR (va triet))*".