Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cam thuc » am thuc, nam thuc, cam thu
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach ty » sach y, sach tu, sach thu
lang ha » long ha
van cam » van nam, van lam, van cau

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 ty ((lang ha) or (lang van)) hoi. hieu van cam thuc va hanh va ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang ha) OR (lang van)) hoi. hieu van cam thuc va hanh va ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang ha) or (lang van)) hoi. hieu van cam thuc va hanh va ((cua triet) or (va triet))*.