Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
tru nang » tra nang, tri nang, truc nano
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
su sach » so sach, vu sach
tu nang » tu nong, tu nano, tu lang
van cau » van dau, van hau, van chat
vi cau » ve cau, di cau, viet cau
va cau » va cac, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((tu nang) or (tru nang)) xa hoi. thien van cau luc van thanh ((vi cau) OR (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tru nang)) xa hoi. thien van cau luc van thanh ((vi cau) OR (va cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) or (tru nang)) xa hoi. thien van cau luc van thanh ((vi cau) OR (va cau)) tren".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) or (tru nang)) xa hoi. thien van cau luc van thanh ((vi cau) OR (va cau)) tren*.