Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
chat luc » chat xuc, chat lua, nhan luc
dua tren » dung tren
su sach » vu sach
luc ban » duc ban, cuc ban, luc bat
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ty tang ma hoa. hieu va chat luc ban thanh tai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty tang ma hoa. hieu va chat luc ban thanh tai ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty tang ma hoa. hieu va chat luc ban thanh tai ((dua tren) or (cuu tre))*".