Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
hanh doi » thanh doi, hanh noi, hang doi
nam thuc » nam thuoc, nam thu, nam tu
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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 ((lang xa) or (tang ma)) hoi. hieu ve ((am thuc) or (nam thuc)) xanh hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (tang ma)) hoi. hieu ve ((am thuc) OR (nam thuc)) xanh hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (tang ma)) hoi. hieu ve ((am thuc) or (nam thuc)) xanh hanh doi cua tre*.