Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
dinh vi » dinh ve, dinh viet, dinh tri
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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: su sach ((ky sang) or (ky dang)) lap tai. hieu ve cac ((tuc va) or (duc va)) dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky dang)) lap tai. hieu ve cac ((tuc va) OR (duc va)) dinh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky dang)) lap tai. hieu ve cac ((tuc va) or (duc va)) dinh vi cua te*.