Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hoc quoc » hoc nuoc, hoc duoc, hoc thuoc
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
hanh lai » hanh lam, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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 dang xay hoi. hieu van ((cac xuc) or (hoc quoc)) va ((hanh lai) or (hanh tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu van ((cac xuc) OR (hoc quoc)) va ((hanh lai) OR (hanh tai)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu van ((cac xuc) or (hoc quoc)) va ((hanh lai) or (hanh tai)) su triet*.