Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
lam duoc » nam duoc, luat duoc, lam thuoc
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
duoc va » nuoc va, duc va, duoc ma
sach ky » sac ky, sach ty, sach kem
xay hoi » xa hoi, tay hoi, cay phoi
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) dang xay hoi. hieu van lam duoc va dinh va ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) dang xay hoi. hieu van lam duoc va dinh va ((cuu tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) dang xay hoi. hieu van lam duoc va dinh va ((cuu tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) dang xay hoi. hieu van lam duoc va dinh va ((cuu tre) or (va triet))*.