Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
nhanh hai » thanh hai, nhanh ha, nganh hai
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
xu va » xu van, tu va, su va

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