Perhaps you should try some spelling variations:
khoa sinh » hoa sinh, khoe sinh, khoa hinh
hong minh » hoang minh, thong minh, khong minh
gioi can » gioi van, gioi han, gioi chau
gioi cam » gioi lam, gioi chau, gia cam
hoach ha » hoach va, hoach xay, hoach hoi
gioi cau » gioi chau, gioi tu, gioi van
cau khoa » cuu khoa, cu khoa, cau hoa
tu sach » thu sach, su sach, te sach
sach ba » sach bai, sach bac, sach bao
me gioi » me giai, ve gioi, me nguoi
ha me » cha me, ha le, ca me

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