Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
hanh ve » hanh va, hanh kem
hieu ke » hieu kem, chieu ke, hieu ky
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
ke cau » ket cau
te bai » te bao, te tai, te ban
te sai » te tai, te lai, te hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sai) OR (te bai)) ky lang ha hoi. hieu ke cau thuc van ((hanh ve) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sai) OR (te bai)) ky lang ha hoi. hieu ke cau thuc van ((hanh ve) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sai) OR (te bai)) ky lang ha hoi. hieu ke cau thuc van ((hanh ve) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sai) OR (te bai)) ky lang ha hoi. hieu ke cau thuc van ((hanh ve) or (hanh vi)) cua triet*.