Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
ky sang » ky dang, ky tang, duy sang
lap lai » lap tai, lay lai, lam lai
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
xuc va » duc va, tuc va, luc va
ve cac » va cac

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 nang)) lap lai. hieu ((ve cac) OR (vien cac)) xuc va danh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky nang)) lap lai. hieu ((ve cac) OR (vien cac)) xuc va danh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) or (ky nang)) lap lai. hieu ((ve cac) OR (vien cac)) xuc va danh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky nang)) lap lai. hieu ((ve cac) OR (vien cac)) xuc va danh vi cua tu*.