Perhaps you should try some spelling variations:
doc sac » doc sach, dac sac, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
luu tre » luu tru, cuu tre, luy tre
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
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: doc sac ky nang cao hoi. hieu ve cam xuc ((va hanh) or (va danh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang cao hoi. hieu ve cam xuc ((va hanh) OR (va danh)) vi luu tre.
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang cao hoi. hieu ve cam xuc ((va hanh) or (va danh)) vi luu tre*.