Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
cua viet » ca viet, hoa viet, cua vat
vien cac » vien bach, vien dai, vien da
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, su sach, vu khach
cac bao » cach bao, cac bai, cac ban
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
tu sach » thu sach, su sach, te sach
bao va » bao ve, tao va, ban va

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) or (vu sach)) ky lang xa hoi. hieu vien cac bao va danh va ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky lang xa hoi. hieu vien cac bao va danh va ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky lang xa hoi. hieu vien cac bao va danh va ((cua triet) or (cua viet))*.