Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
va danh » va dinh, dia danh, va thanh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
ky cong » ke cong, ly cong, khu cong
cong ha » cong hoa, dong ha, cong tac
ha hoi » hoa hoi, ha noi, xa hoi
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
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: doc sach ky cong ha hoi. hieu va cam xuc ((va hanh) or (((va danh) OR (va dan)))) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky cong ha hoi. hieu va cam xuc ((va hanh) OR (((va danh) OR (va dan)))) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky cong ha hoi. hieu va cam xuc ((va hanh) or (((va danh) OR (va dan)))) vi cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach ky cong ha hoi. hieu va cam xuc ((va hanh) or (((va danh) OR (va dan)))) vi cua te*.