Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cam thuc » am thuc, nam thuc, cam thu
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
te sach » toc sach
hieu ve » hieu va, hieu van
hang ca » nang cao, hang tai, hang dau
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
ve cam » ve cham, ve cac, va cam

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