Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh vai » dinh van, dinh vi, dinh va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va
o hoi » co hoi, o hoc, o hai
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang o hoi. hieu va nam thu va dinh vai ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang o hoi. hieu va nam thu va dinh vai ((cua triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang o hoi. hieu va nam thu va dinh vai ((cua triet) or (va thiet))*.