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
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hoi cua » hoi chuc
ve nam » he nam, va nam, le nam

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) OR (sach y)) nang xa hoi. hieu ve 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) OR (sach y)) nang xa hoi. hieu ve 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) OR (sach y)) nang xa hoi. hieu ve nam ((thuc ban) or (thuc dan)) hang hoi cua triet*".