Perhaps you should try some spelling variations:
thuc dan » thuc hanh, thuc vat
hang hoi » hang hoa, hang hai, hang doi
nang ma » tang ma, sang ma, nang cao
hoi cua » hoi chuc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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: su sac ky nang ma hoi. hieu ((ve nam) or (le nam)) ((thuc dan) OR (hoc dan)) hang hoi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. hieu ((ve nam) OR (le nam)) ((thuc dan) OR (hoc dan)) hang hoi cua vat*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ma hoi. hieu ((ve nam) or (le nam)) ((thuc dan) OR (hoc dan)) hang hoi cua vat*".