Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, can thuc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cam thu » nam thu, cac thu, ca thu
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
su sac » su cac, su xac
vi luu » vi lua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su sach)) ky nang xa hoi. hieu qua ((cam thuc) OR (cam thu)) va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky nang xa hoi. hieu qua ((cam thuc) OR (cam thu)) va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su sach)) ky nang xa hoi. hieu qua ((cam thuc) OR (cam thu)) va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky nang xa hoi. hieu qua ((cam thuc) OR (cam thu)) va hanh vi luu tre*.