Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cua nhan » ca nhan, cua ngan, cua nha
sang ma » tang ma, nang ma, sang tao
cua nam » cua tam, cua ngan
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day
tai cau » tai cao
tai cac » tai cuc
ma hoi » mai hoi, xa hoi, ma hoa
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky sang ma hoi. hieu ((cua nam) OR (cua nhan)) thuc va dau ((tai cau) or (tai cac)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky sang ma hoi. hieu ((cua nam) OR (cua nhan)) thuc va dau ((tai cau) OR (tai cac)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky sang ma hoi. hieu ((cua nam) OR (cua nhan)) thuc va dau ((tai cau) or (tai cac)) treo".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky sang ma hoi. hieu ((cua nam) OR (cua nhan)) thuc va dau ((tai cau) or (tai cac)) treo*.