Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ha hoi » hoa hoi, xa hoi, va hoi
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua

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 ky nang ((ha hoi) or (ha noi)). hieu ve nam thuc vat hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ha hoi) OR (ha noi)). hieu ve nam thuc vat hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ha hoi) or (ha noi)). hieu ve nam thuc vat hanh vi cua triet*.