Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
thu hanh » thuc hanh, thu thanh, thuy hanh
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh ma » hanh mau, hanh may, hanh va
va hanh » van hanh, va thanh, va danh
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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 thu hanh ma hoi. hieu ve cam xuc ((va hanh) or (ban hang)) lam ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hanh ma hoi. hieu ve cam xuc ((va hanh) OR (ban hang)) lam ((cua triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu hanh ma hoi. hieu ve cam xuc ((va hanh) or (ban hang)) lam ((cua triet) or (ve triet))*.