Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
lang hoa » hang hoa, lang ha, nang hoa
cam thuc » am thuc, nam thuc, cam thu
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua

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) or (toc sach)) ky lang hoa hoi. ((hieu ve) OR (hieu van)) cam thuc va danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang hoa hoi. ((hieu ve) OR (hieu van)) cam thuc va danh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky lang hoa hoi. ((hieu ve) OR (hieu van)) cam thuc va danh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang hoa hoi. ((hieu ve) OR (hieu van)) cam thuc va danh vi cua triet*.