Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien sach » dien sach, kien sach, thien hach
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dinh vai » dinh van, dinh vi, dinh va
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
sach lo » sach dao, sach doi, sach hoi
va dinh » van dinh, va kinh, va tinh
lo va » lo van, lao va, ly 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 sach lo va dinh vai ((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 sach lo va dinh vai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu hien sach lo va dinh vai ((dua tren) or (cua triet))*.