Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien bach » vien bach, thien hach, hien hanh
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
bach lao » bach mao, bach giao, bach mai
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
lao va » tao va, cao va, bao va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x ho. hieu hien bach lao va dinh van ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x ho. hieu hien bach lao va dinh van ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu hien bach lao va dinh van ((dua tren) or (cua triet))*.