Perhaps you should try some spelling variations:
hanh dai » hanh dao, vanh dai, thanh dat
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
te sach » toc sach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang o hoi. hieu ve am thuc va ((hanh dai) or (hanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang o hoi. hieu ve am thuc va ((hanh dai) OR (hanh tai)) va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang o hoi. hieu ve am thuc va ((hanh dai) or (hanh tai)) va triet*.