Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach vu » sach va, sach tu, sach uu
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
vu nang » vuc nang, va nang, vu dang
cau luc » cau truc, cau phuc
ve thu » ve thuc, va thu, vu thu
x hoi » xa hoi, o hoi, x ho
ve tu » va tu, ve su, ve du

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