Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thanh tai » thanh hai, thanh toan, doanh tai
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
ve cac » va cac, vien cac
cac bo » bac bo, cac co
bo van » vo van, so van, do van
nang o » nang co, nang ho, nang ro
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 nang o hoi. hieu ve cac bo van ((hanh lai) or (thanh tai)) ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu ve cac bo van ((hanh lai) OR (thanh tai)) ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu ve cac bo van ((hanh lai) or (thanh tai)) ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ve cac bo van ((hanh lai) or (thanh tai)) ((cua triet) OR (va triet))*.