Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
hoc sach » hoc sinh, hoc cac, hoc anh
thi nang » thi cong, ki nang, thi hanh
thu nang » thu hang, thu bang, tho nang
xanh di » danh di, vanh dai, xanh tai
hanh ve » hanh vi, hanh va, hanh kem
ca thuc » can thuc, cay thuc, va thuc
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((thu nang) OR (thi nang)) xa hoi. hieu qua ca thuc day ((xanh di) or (hanh ve)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((thu nang) OR (thi nang)) xa hoi. hieu qua ca thuc day ((xanh di) OR (hanh ve)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((thu nang) OR (thi nang)) xa hoi. hieu qua ca thuc day ((xanh di) or (hanh ve)) cua triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((thu nang) OR (thi nang)) xa hoi. hieu qua ca thuc day ((xanh di) or (hanh ve)) cua triet*.