Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
vai cua » hai cua, lai cua, bai cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
luc va » duc va, tuc va, loc va
xuc va » duc va, tuc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu vien cac ((xuc va) or (luc va)) hanh ((vai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu vien cac ((xuc va) OR (luc va)) hanh ((vai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu vien cac ((xuc va) or (luc va)) hanh ((vai cua) or (dai cua)) triet*.