Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang doc » nang luc
nang co » nang cao, nang noi, nang hoc
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
han tai » hang tai, nhan tai, van tai
tai cua » thai cua, tai cuc, tri cua
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang co) or (nang doc)) hoi. hieu ve cac ((duc van) or (duc tan)) han tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang co) OR (nang doc)) hoi. hieu ve cac ((duc van) OR (duc tan)) han tai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang co) or (nang doc)) hoi. hieu ve cac ((duc van) or (duc tan)) han tai cua triet*.