Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
ve cac » va cac, vien cac
cua te » cua tu
du va » dau va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((nang ma) OR (sang ma)) hoa. hieu ve cac du va thanh dat ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (sang ma)) hoa. hieu ve cac du va thanh dat ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang ma) OR (sang ma)) hoa. hieu ve cac du va thanh dat ((cua tre) or (cua te))*".