Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sang lap » sang tao, sang ma, sang tai
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va hanh, dia danh
su sach » so sach, vu sach
lap hai » lap tai, lap lai, lap hoat
ky sang » ky nang, ky dang, ky tang
cua tuc » cua duc, cua tu, cua thuoc
ve cac » va cac
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua

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 lap hai. hieu ((ve cac) OR (vien cac)) xuc ((va danh) or (va dan)) vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang lap hai. hieu ((ve cac) OR (vien cac)) xuc ((va danh) OR (va dan)) vi cua tuc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang lap hai. hieu ((ve cac) OR (vien cac)) xuc ((va danh) or (va dan)) vi cua tuc*".