Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va 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
ve triet » va trien, su 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 (ve 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 (ve 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 (ve triet))*.