Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
tinh vai » tinh va, tinh hai, tinh bai
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
hieu ve » hieu va, hieu van
cham lo » cham o, cham soc, cham hoi
ma hoi » mai hoi, xa hoi, ma hoa
cam lo » nam lo, cam ly, cam o
7 tang » 6 tang
5 tang » 6 tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((5 tang) or (7 tang)) ma hoi. hieu ve ((cham lo) or (cam lo)) va tinh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((5 tang) OR (7 tang)) ma hoi. hieu ve ((cham lo) OR (cam lo)) va tinh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((5 tang) or (7 tang)) ma hoi. hieu ve ((cham lo) or (cam lo)) va tinh vai cua triet*.