Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
su sach » vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
va cam » va cham, va cac, 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) or (so sach)) y nang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh va cua tre*.