Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
thai cua » than cua, tai cuc, tri cua
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
dai tuc » dai thuc, dai truc, dao tuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi cua » vai 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: vu ((sach ty) OR (sach y)) nang xa hoi. hieu vien dai tuc va hanh ((vi cua) or (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) nang xa hoi. hieu vien dai tuc va hanh ((vi cua) OR (thai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) OR (sach y)) nang xa hoi. hieu vien dai tuc va hanh ((vi cua) or (thai cua)) triet*".