Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
thi van » thi lan, thi hanh, thi nang
van am » van nam, van lam, van dam
x hoi » xa hoi, o hoi, x ho
di ve » dai ve, do ve, di le

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 tu nang x hoi. thi van am ((thuc dan) or (thuc vat)) hanh ((di ve) or (de ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang x hoi. thi van am ((thuc dan) OR (thuc vat)) hanh ((di ve) OR (de ve)) triet.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang x hoi. thi van am ((thuc dan) or (thuc vat)) hanh ((di ve) or (de ve)) triet*.