Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham duc » pham duc, tham du, than duc
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
va tham » van tham, va cham, va thanh
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
su tien » su kien, su hien, tu tieng

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 ty) or (sach y)) nang xa hoi. hieu va tham duc van hanh vi ((cua triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang xa hoi. hieu va tham duc van hanh vi ((cua triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang xa hoi. hieu va tham duc van hanh vi ((cua triet) or (su tien))*.