Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
qua ban » cua ban, qua quan
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
sach ty » sach y, sach tu, sach thu
ca qua » cau qua, cac qua, ca quan
va ca » va cac, va cao, va cai

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) OR (sach ty)) sang ma hoa. hieu va ca qua ban ((thanh vai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) sang ma hoa. hieu va ca qua ban ((thanh vai) OR (thanh hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) sang ma hoa. hieu va ca qua ban ((thanh vai) or (thanh hai)) cua tre*".