Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vu khanh » vu thanh, van khanh, duy khanh
vien cac » vien bach, vien dai, vien da
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa
vi 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: ((te sach) or (vu khanh)) ky nang ma hoi. hieu vien cac nuoc va hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu khanh)) ky nang ma hoi. hieu vien cac nuoc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu khanh)) ky nang ma hoi. hieu vien cac nuoc va hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu khanh)) ky nang ma hoi. hieu vien cac nuoc va hanh ((vi cua) OR (vai cua)) triet*.