Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
dinh vai » dinh van, dinh vi, dinh va
dua tren » dung tren
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va dinh » van dinh, va kinh, va tinh
cac lo » cac lop, cac co, cac bo
x hoi » xa hoi, o hoi, x ho
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: so sach ty nang x hoi. hieu hien cac lo va dinh vai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. hieu hien cac lo va dinh vai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. hieu hien cac lo va dinh vai ((dua tren) or (cua triet))*.