Perhaps you should try some spelling variations:
thanh luc » thanh luu, than luc, nhan luc
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, duc van
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((hieu van) OR (lieu va)) thanh luc van hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((hieu van) OR (lieu va)) thanh luc van hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. ((hieu van) OR (lieu va)) thanh luc van hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((hieu van) OR (lieu va)) thanh luc van hanh ((vai cua) or (hai cua)) tre*.