Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach y) or (sac ky)) tang ma hoi. hieu ve am thuc van ((hanh di) OR (hang di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) tang ma hoi. hieu ve am thuc van ((hanh di) OR (hang di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) tang ma hoi. hieu ve am thuc van ((hanh di) OR (hang di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) tang ma hoi. hieu ve am thuc van ((hanh di) OR (hang di)) cua tre*.