Perhaps you should try some spelling variations:
khoa sinh » hoa sinh, khoe sinh, khoa hinh
sach bao » sach dao, sach bai, sach bac
can hong » chan hong, can dong, cay hong
can song » can dong, cau song, con song
hoach ha » hoach va, hoach xay, hoach hoi
giai cuu » gian cua, giai mau, gia cua
tu sach » thu sach, su sach, te sach
me giai » de giai, ve giai, ke giai
bao me » bao ve, ba me, bo me
ha me » cha me, ba me, ha le

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 bao me giai ((can hong) or (can song)) minh ) or ( thu hoach ha me giai cuu khoa sinh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach bao me giai ((can hong) OR (can song)) minh ) OR ( thu hoach ha me giai cuu khoa sinh )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach bao me giai ((can hong) or (can song)) minh ) or ( thu hoach ha me giai cuu khoa sinh ))*.