Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hoa » thanh pho
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
nang ma » tang ma, sang ma, nang cao
sach ky » sach y, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) nang ma hoi. hieu van nam thuc va ((thanh vi) or (thanh hoa)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang ma hoi. hieu van nam thuc va ((thanh vi) OR (thanh hoa)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang ma hoi. hieu van nam thuc va ((thanh vi) or (thanh hoa)) cua triet*".