Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thu nang » thi nang, thu hang, thu bang
tinh hai » tinh thai, tinh chat, trinh han
tu sach » su sach, te sach, tu cach
hai cua » thai cua, dai cua, hoi cua
tuc may » truc may, tu may, tuc xay
cau tuc » cau truc, cau tu, cau luc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu ve) or (hieu qua)) cau tuc may tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thu nang x hoi. ((hieu ve) OR (hieu qua)) cau tuc may tinh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thu nang x hoi. ((hieu ve) or (hieu qua)) cau tuc may tinh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thu nang x hoi. ((hieu ve) or (hieu qua)) cau tuc may tinh hai cua tre*.