Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
cua tre » cuu tre, cua triet, dua tren
xa danh » va danh, dia danh, nam danh
cac tuc » cac toc, cac tu, cac tac
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 nang ma hoi. ((hieu ve) OR (hieu van)) cac tuc xa danh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tuc xa danh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tuc xa danh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. ((hieu ve) OR (hieu van)) cac tuc xa danh doi ((cua tre) or (cua te))*.