Perhaps you should try some spelling variations:
cua triet » su triet, va triet
danh vai » danh sai, danh va, doanh van
cua viet » ca viet, hoa viet, cua vat
thu xac » thau xay
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
xac ky » cac ky, sac ky, bac ky
nang o » nang co, nang ro, nang x
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky ((nang o) OR (nang ho)) hoi. hieu va cac lo va danh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky ((nang o) OR (nang ho)) hoi. hieu va cac lo va danh vai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu xac ky ((nang o) OR (nang ho)) hoi. hieu va cac lo va danh vai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thu xac ky ((nang o) OR (nang ho)) hoi. hieu va cac lo va danh vai ((cua triet) or (cua viet))*.