Perhaps you should try some spelling variations:
thanh tinh » thanh binh, nhanh tinh, than kinh
thanh dinh » thanh binh, thanh vinh, thanh kinh
cua triet » cua viet, su triet, va triet
nam vua » nam va, nam cua, nam mua
vua ban » cua ban, qua ban, va ban
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
o hoi » co hoi, o hoc, o hai

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 ky) OR (sac ky)) nang o hoi. hieu va nam vua ban ((thanh dinh) or (thanh tinh)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hoi. hieu va nam vua ban ((thanh dinh) OR (thanh tinh)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang o hoi. hieu va nam vua ban ((thanh dinh) or (thanh tinh)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang o hoi. hieu va nam vua ban ((thanh dinh) or (thanh tinh)) cua triet*.