Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lap » thanh san, phan lap, thanh hai
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
chat xuc » chat huu, cam xuc, chao xu
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tai hai » thi hai, dai hai, tai ha
lap va » tap va

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 tai hai. hieu van ((cac nuoc) or (chat xuc)) ban thanh lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang tai hai. hieu van ((cac nuoc) OR (chat xuc)) ban thanh lap va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang tai hai. hieu van ((cac nuoc) or (chat xuc)) ban thanh lap va triet*.