Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh va » hang va
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thu) or (cach tu)) nang xa hoi. hieu va cao tuc xa ((hanh va) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (cach tu)) nang xa hoi. hieu va cao tuc xa ((hanh va) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (cach tu)) nang xa hoi. hieu va cao tuc xa ((hanh va) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (cach tu)) nang xa hoi. hieu va cao tuc xa ((hanh va) OR (hanh vi)) cua tre*.