Perhaps you should try some spelling variations:
nhung ngot » nhung nguoi, nhung goc, nhung nghi
khoe nghe » kho nghe
ngot khoa » ngoai khoa, noi khoa, go khoa
thu sach » tu sach, thuat sach, thuoc sach
khoa hoc » hoa hoc
hoa nghe » hoc nghe, chon nghe, so nghe
nha hoc » nha thuoc, nha nuoc, thai hoc
khoa vi » hoa vi, khoan va, khoa doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((nha hoc) or (khoa hoc)) ((hoa nghe) OR (khoe nghe)) che ets : nhung ngot khoa vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((nha hoc) OR (khoa hoc)) ((hoa nghe) OR (khoe nghe)) che ets : nhung ngot khoa vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((nha hoc) or (khoa hoc)) ((hoa nghe) OR (khoe nghe)) che ets : nhung ngot khoa vi đai".
• Adding a wildcard symbol may retrieve word variants: thu sach ((nha hoc) or (khoa hoc)) ((hoa nghe) OR (khoe nghe)) che ets : nhung ngot khoa vi đai*.