Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va dinh » van dinh, va kinh, va tinh
dinh tu » danh tu, dinh cu, tinh tu
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu ((ve cam) or (ve cac)) duc va dinh tu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) duc va dinh tu va thiet.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((ve cam) or (ve cac)) duc va dinh tu va thiet*.