Perhaps you should try some spelling variations:
quoc bao » quoc oai, hoc bao, quoc va
ky tuong » ky thuong, y tuong, ky trong
tuong ho » tong hop
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
xuc ban » duc ban, cuc ban, quoc ban
sach ky » sac ky, sach y, sach ty
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet
ho hai » hoc hai, pho hai, cho hai

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 ky tuong ho hai. hieu van bao ((((xuc ban) or (quoc bao))) or (duc manh)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tuong ho hai. hieu van bao ((((xuc ban) OR (quoc bao))) OR (duc manh)) hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tuong ho hai. hieu van bao ((((xuc ban) or (quoc bao))) or (duc manh)) hanh tai cua tre*.