Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
duc manh » suc manh, duc anh, duc minh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang ho » tang cho, tung ho, tang ha
van bao » van ban, van dao
xuc ban » duc ban, cuc ban, xuat ban
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 ban))) or (duc manh)) 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 ban))) OR (duc manh)) 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 ban))) or (duc manh)) hanh tai cuc tre*.