Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang noi » nang doc
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
sach ky » sac ky, sach y, sach ty
noi hoi » noi doi, doi hoi, hoi hoi
hieu vi » hieu voi, hieu va, hieu ve
di cua » doi cua, de cua, do cua

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 ky nang noi hoi. hieu vi pham ((thuc day) or (thuc dan)) hanh ((di cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang noi hoi. hieu vi pham ((thuc day) OR (thuc dan)) hanh ((di cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang noi hoi. hieu vi pham ((thuc day) or (thuc dan)) hanh ((di cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang noi hoi. hieu vi pham ((thuc day) or (thuc dan)) hanh ((di cua) OR (dai cua)) te*.