Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
toc sac » toc sach, toc san, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
duoc va » nuoc va, duoc ma, duong va
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang xa hoi. hieu van lam ((duoc va) or (duc va)) doanh van ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang xa hoi. hieu van lam ((duoc va) OR (duc va)) doanh van ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang xa hoi. hieu van lam ((duoc va) or (duc va)) doanh van ((cua tre) or (cua triet))*.