Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
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: thu sach ((ky sang) or (ky dang)) ma hoi. hieu ve cam thuc van hanh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky dang)) ma hoi. hieu ve cam thuc van hanh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) or (ky dang)) ma hoi. hieu ve cam thuc van hanh vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky dang)) ma hoi. hieu ve cam thuc van hanh vi ((cua triet) OR (va triet))*.