Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
tuan vai » tuan tai, trang vai, tuan khai
sach kho » bach khoa, sach dao, sach nha
su triet » su viet, su tien, ve triet
kho tang » cao tang
xuc anh » duc anh, luc canh, suc manh
hieu ve » hieu va, hieu van
ma hoi » mai hoi, ma hoa, me hoi
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: hoc sach kho tang ((ma hoi) OR (xa hoi)). hieu ve cam xuc anh tuan vai ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach kho tang ((ma hoi) OR (xa hoi)). hieu ve cam xuc anh tuan vai ((va triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach kho tang ((ma hoi) OR (xa hoi)). hieu ve cam xuc anh tuan vai ((va triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sach kho tang ((ma hoi) OR (xa hoi)). hieu ve cam xuc anh tuan vai ((va triet) or (su triet))*.