Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
va danh » va dinh, va hanh, dia danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
lap hai » lap lai, lap hoat, lanh hai
ky sang » ky nang, ky dang, ky tang
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
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 sach ky sang ((lap hai) or (lap tai)). hieu vien cac xuc ((va danh) or (va dan)) vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((lap hai) OR (lap tai)). hieu vien cac xuc ((va danh) OR (va dan)) vi cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((lap hai) or (lap tai)). hieu vien cac xuc ((va danh) or (va dan)) vi cua tu*.