Perhaps you should try some spelling variations:
doc sac » doc sach, dac sac, hoc sach
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
nang co » nang cao, nang doc, nang noi
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
vi luu » vi lua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sac ky nang co hoi. hieu ((va cam) or (ve cac)) xuc ((va hanh) or (dia ban)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang co hoi. hieu ((va cam) OR (ve cac)) xuc ((va hanh) OR (dia ban)) vi luu tre.
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang co hoi. hieu ((va cam) or (ve cac)) xuc ((va hanh) or (dia ban)) vi luu tre*.