Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thu nang » thi nang, thu hang, thu bang
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
ban hai » ban thai, bang hai, van hai
tuc dia » thuc dia, tuc di, tuc gia
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) thu nang xa hoi. ((hieu ve) or (hieu va)) cam tuc dia ban hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thu nang xa hoi. ((hieu ve) OR (hieu va)) cam tuc dia ban hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thu nang xa hoi. ((hieu ve) or (hieu va)) cam tuc dia ban hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thu nang xa hoi. ((hieu ve) or (hieu va)) cam tuc dia ban hai cua tre*.