Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh va » thanh van, hanh va, thanh ha
thanh ve » hanh ve, thanh vien, thanh van
luc ban » duc ban, cuc ban, luc bat
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((y nang) or (v nang)) xa hoi. hieu va cao luc ban ((thanh ve) OR (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (v nang)) xa hoi. hieu va cao luc ban ((thanh ve) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y nang) or (v nang)) xa hoi. hieu va cao luc ban ((thanh ve) OR (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) or (v nang)) xa hoi. hieu va cao luc ban ((thanh ve) OR (thanh va)) cua tre*.