Perhaps you should try some spelling variations:
thuc dan » hoc dan, thuc vat
hieu ve » hieu va, hieu van
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
ve nam » he nam, va nam, le nam
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 y nang o hoi. hieu ve nam ((thuc dan) or (thuc hanh)) manh ((vai cua) OR (hai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ve nam ((thuc dan) OR (thuc hanh)) manh ((vai cua) OR (hai cua)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hoi. hieu ve nam ((thuc dan) or (thuc hanh)) manh ((vai cua) OR (hai cua)) viet*".