Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hanh » ban hang
danh xay » dang xay, manh xay, anh xay
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
cua tre » cuu tre, cua triet, dua tren
hanh va » hang va, hanh vi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
luc ban » duc ban, cuc ban, luc bat
cua te » cua tu

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 danh xay hoi. hieu van nhan luc ban hanh va ((((cua tre) OR (cua te))) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky danh xay hoi. hieu van nhan luc ban hanh va ((((cua tre) OR (cua te))) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky danh xay hoi. hieu van nhan luc ban hanh va ((((cua tre) OR (cua te))) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky danh xay hoi. hieu van nhan luc ban hanh va ((((cua tre) OR (cua te))) or (su triet))*.