Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh dan » doanh ban, doanh van, doanh dao
va doanh » van doanh, vay doanh, va danh
cua tre » cuu tre, cua triet, dua tren
cac tuc » cac toc, cac tu, cac tac
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

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