Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luy tre » luyen tre
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
xuc va » tuc va, luc va, xac va
va luy » va duy, va ly, va luyen

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 lang) OR (_ lang)) xa hoi. hieu va cham ((xuc va) or (duc va)) thanh va luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (_ lang)) xa hoi. hieu va cham ((xuc va) OR (duc va)) thanh va luy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (_ lang)) xa hoi. hieu va cham ((xuc va) or (duc va)) thanh va luy tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (_ lang)) xa hoi. hieu va cham ((xuc va) or (duc va)) thanh va luy tre*.