Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
quoc bao » quoc oai, hoc bao, quoc va
tu sach » thu sach, su sach, te sach
xuc ban » duc ban, cuc ban, quoc ban
duc van » duc va, duc tan, duc manh
sach ky » sac ky, sach y, sach ty
van bao » van ban, van dao
tang ho » tang cho, tung ho, tang ha
ky tang » ky nang, ky dang, kho tang
cuc tre » duc tre, cua tre, cuu tre
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 tang ho hai. hieu van bao ((((xuc ban) or (quoc bao))) or (duc van)) hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ho hai. hieu van bao ((((xuc ban) OR (quoc bao))) OR (duc van)) hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ho hai. hieu van bao ((((xuc ban) or (quoc bao))) or (duc van)) hanh tai cuc tre*.