Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
cau cua » cau qua, ca cua, cu cua
mat cua » ma cua, manh cua, mang cua
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ((y nang) OR (ky nang)) ma hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) ma hoi. hieu va cham duc van hanh ((cau cua) OR (mat cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) ma hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) ma hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet*.