Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
dau tren » dau tien, dat tren, dau tieng
sach kem » hanh kem
hieu va » lieu va, hieu qua
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
tai dau » tac dau, tai du, thi dau
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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 kem) or (sac ky)) nang ((xa hoi) or (ma hoa)). hieu va nam dua ban thanh tai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang ((xa hoi) OR (ma hoa)). hieu va nam dua ban thanh tai dau tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang ((xa hoi) or (ma hoa)). hieu va nam dua ban thanh tai dau tren*.