Perhaps you should try some spelling variations:
nang noi » nang doc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
ve am » va am
va ve » va de, va le, va vi

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 x) or (nang noi)) hoi. hieu ve am thuc dan hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang x) OR (nang noi)) hoi. hieu ve am thuc dan hanh va ve triet*.