Perhaps you should try some spelling variations:
bach thuc » cach thuc, bach thu, thach thuc
thanh hai » thanh phan, thanh hoa, thanh san
thanh lap » thanh san, phan lap, thanh van
thu sach » thuat sach, thuoc sach, thu hoach
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
ve bach » ve cach, vu bach, vi bach
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)) ky nang x hoi. hieu ve bach thuc va ((thanh lap) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu ve bach thuc va ((thanh lap) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu ve bach thuc va ((thanh lap) OR (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. hieu ve bach thuc va ((thanh lap) OR (thanh hai)) cua tre*.