Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
chat duc » chat xuc, chat doc, chet duoc
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
ve chat » va chat, van chat
x hoi » xa hoi, o hoi, x ho

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) or (su sach)) ty nang x hoi. hieu ve chat duc van hanh lai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu ve chat duc van hanh lai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang x hoi. hieu ve chat duc van hanh lai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang x hoi. hieu ve chat duc van hanh lai ((cua triet) OR (va triet))*.