Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
sach ky » sac ky, sach ty, sach kem
nam luc » nang luc, nhan luc, nam thuc
luc ban » duc ban, cuc ban, luc bat
cuu tre » cua tre, cau tren, cau treo

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) dang xay hoi. hieu van nam luc ban thanh vi ((cuu tre) OR (cua 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 nam luc ban thanh vi ((cuu tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) dang xay hoi. hieu van nam luc ban thanh vi ((cuu tre) or (cua triet))*.