Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
toc sach » hoc sach, doc sach, thuoc sach
hien cac » thien cac, vien cac, hieu cac
tu tieng » luc tieng, tu tuong, tu trong
cac bac » cac bai, cac ban, cac cach
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su tien » su kien, su hien, dau tien
y nang » ky nang, ly nang, v nang
bac va » ban va, bac ha, bao 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: toc sach y nang x hoi. hieu hien cac bac va danh vi ((su tien) OR (tu tieng))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang x hoi. hieu hien cac bac va danh vi ((su tien) OR (tu tieng))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu hien cac bac va danh vi ((su tien) OR (tu tieng))*.