Perhaps you should try some spelling variations:
hang dau » hang tai
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
hanh va » hanh vi
thuc va » thuc vat, thuc dan
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach ty
su tien » su kien, su hien, tu tieng
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 ly ((hang dau) or (hang va)) hoi. hieu ve am ((thuc va) OR (thuc day)) hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((hang dau) OR (hang va)) hoi. hieu ve am ((thuc va) OR (thuc day)) hanh va su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((hang dau) or (hang va)) hoi. hieu ve am ((thuc va) OR (thuc day)) hanh va su tien".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((hang dau) or (hang va)) hoi. hieu ve am ((thuc va) OR (thuc day)) hanh va su tien*.