Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc ban » thuoc ban, thu ban, thuc van
hang hoi » hang hoa, hang hai, hang doi
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hoi cua » hoi chuc
so sach » so sanh, bo sach, co sach
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu ((ve nam) OR (le nam)) ((thuc ban) or (thuc dan)) hang hoi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu ((ve nam) OR (le nam)) ((thuc ban) OR (thuc dan)) hang hoi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu ((ve nam) OR (le nam)) ((thuc ban) or (thuc dan)) hang hoi cua triet*".