Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
xuc tuan » duc thuan, quoc tuan, xuan tuan
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cac xuc » cam xuc, cac nuoc, chat xuc
hanh va » hang va, hanh vi
x hoi » xa hoi, o hoi, x ho

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

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