Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
nang ban » hang ban, nang quan, nang sang
nang cap » nang cao, nang cham, nang phap
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
vu sach » su sach, vu khach
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu bach)) ky ((nang ban) or (nang cap)) hoi. hieu va cam tu va hanh than cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) ky ((nang ban) OR (nang cap)) hoi. hieu va cam tu va hanh than cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) ky ((nang ban) or (nang cap)) hoi. hieu va cam tu va hanh than cua triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu bach)) ky ((nang ban) or (nang cap)) hoi. hieu va cam tu va hanh than cua triet*.