Perhaps you should try some spelling variations:
nhung cau » chung cu, nhung bai, nhu cau
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, nuoc sach, dac sac
toc sach » hoc sach, thuoc sach, nuoc sach
ty nhung » tay nhung, tu nhung, ky nhung
qua cac » cua cac
hanh de » hanh ve, hanh kem
xuc va » tuc va, luc va, xac va
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) OR (toc sach)) ty nhung cau hoi. hieu qua cac ((xuc va) or (duc va)) hanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) ty nhung cau hoi. hieu qua cac ((xuc va) OR (duc va)) hanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) ty nhung cau hoi. hieu qua cac ((xuc va) or (duc va)) hanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (toc sach)) ty nhung cau hoi. hieu qua cac ((xuc va) or (duc va)) hanh de cua triet*.