Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
ca cua » co cua

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 (te sach)) y nang mai hoi. hieu va cac ((xuc va) OR (luc va)) dan ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang mai hoi. hieu va cac ((xuc va) OR (luc va)) dan ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang mai hoi. hieu va cac ((xuc va) OR (luc va)) dan ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang mai hoi. hieu va cac ((xuc va) OR (luc va)) dan ca cua tre*.