Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sai ky » sac ky
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
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 ty) or (sai ky)) nang xa hoi. hieu ve ((cam tu) OR (dam tu)) va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sai ky)) nang xa hoi. hieu ve ((cam tu) OR (dam tu)) va thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sai ky)) nang xa hoi. hieu ve ((cam tu) OR (dam tu)) va thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sai ky)) nang xa hoi. hieu ve ((cam tu) OR (dam tu)) va thanh di cua tre*.