Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sang lap » sang tao, sang tai, dan lap
danh vi » hanh vi, dinh vi, danh di
sang ma » tang ma, nang ma, sang tao
va danh » va dinh, va dan, va hanh
su sac » su sach, su cac, su xac
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
ve cac » va cac
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((sang lap) or (sang ma)) hai. 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 sac ky ((sang lap) OR (sang ma)) hai. 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 sac ky ((sang lap) or (sang ma)) hai. hieu ((ve cac) OR (vien cac)) xuc va danh vi cua tu*".