Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tay quang » tac quang, tai quang, tao quang
ban thanh » ban hanh, ban hang
quang ma » xquang ma, quang va, quang manh
sach tay » xach tay, sach hay, sach nay
so sach » so sanh, bo sach, co sach
tai cua » thai cua, tai cuc, tri cua
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tay quang ma hoa. ((hieu va) or (lieu va)) ((nhan luc) OR (nang luc)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay quang ma hoa. ((hieu va) OR (lieu va)) ((nhan luc) OR (nang luc)) ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tay quang ma hoa. ((hieu va) or (lieu va)) ((nhan luc) OR (nang luc)) ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tay quang ma hoa. ((hieu va) or (lieu va)) ((nhan luc) OR (nang luc)) ban thanh tai cua tre*.