Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
dan hanh » dang hanh, dan khanh, dan thanh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
phap cu » phap cau, phap chu, phap tu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
tu lanh » tu hanh, tu manh, tu anh
cu dan » cua dan, ca dan, co dan

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 ((tu lanh) OR (tu lenh)) xa hoi. ((hieu ve) or (hieu va)) phap cu dan hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((tu lanh) OR (tu lenh)) xa hoi. ((hieu ve) OR (hieu va)) phap cu dan hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((tu lanh) OR (tu lenh)) xa hoi. ((hieu ve) or (hieu va)) phap cu dan hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((tu lanh) OR (tu lenh)) xa hoi. ((hieu ve) or (hieu va)) phap cu dan hanh hai cua tre*.