Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
dua ban » dia ban, cua ban, qua ban
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 (su sach)) y nang mai hoi. ((hieu ve) or (lieu va)) chay dua ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang mai hoi. ((hieu ve) OR (lieu va)) chay dua ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang mai hoi. ((hieu ve) or (lieu va)) chay dua ban thanh tai cua tre*.