Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
cua triet » cua viet, su triet, va triet
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
than cua » nhan cua, thai cua, ban cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
xuc va » tuc va, luc va, xac 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 mai hoi. hieu van chat ((xuc va) OR (duc va)) doanh than cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang mai hoi. hieu van chat ((xuc va) OR (duc va)) doanh than cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai hoi. hieu van chat ((xuc va) OR (duc va)) doanh than cua triet*.