Perhaps you should try some spelling variations:
ve triet » va trien, su triet
so triet » su triet, so thiet, bo triet
hang lam » hoang lam, phang lam, hanh lam
ban hang » ngan hang
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
cau duc » cao duc, cau luc, chu duc
hieu va » hieu qua
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 hai. ((hieu va) OR (lieu va)) cau duc ban hang lam ((so triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. ((hieu va) OR (lieu va)) cau duc ban hang lam ((so triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. ((hieu va) OR (lieu va)) cau duc ban hang lam ((so triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. ((hieu va) OR (lieu va)) cau duc ban hang lam ((so triet) or (ve triet))*.