Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va
loc va » hoc va
di cua » dai cua, doi cua, de cua

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 (te sach)) ky lang xa hoi. hieu va nhan ((luc va) OR (loc va)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky lang xa hoi. hieu va nhan ((luc va) OR (loc va)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky lang xa hoi. hieu va nhan ((luc va) OR (loc va)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky lang xa hoi. hieu va nhan ((luc va) OR (loc va)) thanh di cua tre*.