Perhaps you should try some spelling variations:
cac thuc » cach thuc, can thuc, cay thuc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cac thu » cach thuc, cac thoi
dau dai » dat dai, sau dai, dau da
va dau » va dao
dai su » dai sua, dai so, dan su

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 xa hoi. lieu va ((cac thuc) OR (cac thu)) va dau dai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. lieu va ((cac thuc) OR (cac thu)) va dau dai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. lieu va ((cac thuc) OR (cac thu)) va dau dai su triet*.