Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
su triet » su viet, su tien, ve triet
cau treo » cau theo, cau tren, cau triet
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
xuc va » tuc va, luc va, xac va
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 tu nang x hoi. hieu vien cac ((xuc va) or (duc va)) hanh vai ((cau treo) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x hoi. hieu vien cac ((xuc va) OR (duc va)) hanh vai ((cau treo) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. hieu vien cac ((xuc va) or (duc va)) hanh vai ((cau treo) or (su triet))*.