Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
hieu sau » hieu su, hieu suat, tieu su
sau chao » sau cho, sau chan, cau cham
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang dai hoc. hieu sau chao xu ((va danh) OR (va dinh)) ((vi cua) OR (di cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang dai hoc. hieu sau chao xu ((va danh) OR (va dinh)) ((vi cua) or (di cua)) te~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang dai hoc. hieu sau chao xu ((va danh) OR (va dinh)) ((vi cua) or (di cua)) te*.