Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh va » thanh van, hanh va, thanh ha
thu sach » thuat sach, thuoc sach, thu hoach
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
tu nang » tu nong, tu nano, tu lang
cao tre » cho tre, choi tre
va cao » va cac, va co, va dao

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