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
hang ban » hang luan, hang va, hang tai
nang cap » nang cao, nang cham, nang phap
va hanh » van hanh, va thanh, va danh
cam luc » cau luc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua

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