Perhaps you should try some spelling variations:
dau luan » dan luan, dat luan, khau luan
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
dai cuu » dai cua, dai huu
dai dai » dat dai, dai hai, dai tai
cua dai » cua dan, cua dang
cuu tre » cua tre, cau tren, cau treo
dau luc » cau luc, dau nuoc, dau luot
hieu va » lieu va, hieu qua
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 va ((dau luc) OR (dau luan)) cua dai dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu va ((dau luc) OR (dau luan)) cua dai dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu va ((dau luc) OR (dau luan)) cua dai dai cuu tre*".