Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thien va » thien van, tien va, thien tai
lap cua » lai cua, tap cua, lam cua
va cham » va chat, va tham
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
luc va » duc va, loc va
co hoi » co hoc

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 nang ((co hoi) OR (co loi)). thien va cham ((tuc va) or (luc va)) thanh lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((co hoi) OR (co loi)). thien va cham ((tuc va) OR (luc va)) thanh lap cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((co hoi) OR (co loi)). thien va cham ((tuc va) or (luc va)) thanh lap cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((co hoi) OR (co loi)). thien va cham ((tuc va) or (luc va)) thanh lap cua tre*.