Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van duoc » van duc, vat duoc, tan duoc
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
tuc ca » tuc cac, tuc cua, tuc co
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: su sach ky dang xay hoi. hieu van duoc ((tuc ca) or (tuc xa)) tinh va ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu van duoc ((tuc ca) OR (tuc xa)) tinh va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu van duoc ((tuc ca) or (tuc xa)) tinh va ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu van duoc ((tuc ca) or (tuc xa)) tinh va ((cua tre) OR (cua te))*.