Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » hieu va, thien van, hieu ve
tu sach » thu sach, su sach, te sach
bao luc » bao thuc
luc tan » luc tai, duc tan, luc tam
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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