Perhaps you should try some spelling variations:
luoc van » luoc va, luc van, luot van
luoc can » luc canh, hoc can, luoc dai
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
qua da » qua ca, qua di, qua va
vi cua » vai cua, di cua
de cua » le cua, te cua, dieu 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 y nang xa hoi. hieu qua da ((luoc van) OR (luoc can)) anh ((vi cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. hieu qua da ((luoc van) OR (luoc can)) anh ((vi cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang xa hoi. hieu qua da ((luoc van) OR (luoc can)) anh ((vi cua) or (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu qua da ((luoc van) OR (luoc can)) anh ((vi cua) or (de cua)) tre*.