Perhaps you should try some spelling variations:
thuc dan » hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang ma » sang ma, nang cao, mang may
hanh de » hanh ve, hanh kem
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
de cua » le cua, te cua, dieu cua
va cau » van cau, va cac, va dau
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: tu sach y ((nang ma) OR (tang ma)) hoi. hieu va cau ((thuc dan) or (thuc hanh)) hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (tang ma)) hoi. hieu va cau ((thuc dan) OR (thuc hanh)) hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang ma) OR (tang ma)) hoi. hieu va cau ((thuc dan) or (thuc hanh)) hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) OR (tang ma)) hoi. hieu va cau ((thuc dan) or (thuc hanh)) hanh de cua te*.