Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
sach thu » sach thue, sach thieu, sach tham
hanh hai » thanh hai, hang hai, hanh tai
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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 ky) or (sach thu)) nang xa hoi. lieu va cac tuc va ((hanh hai) OR (nhanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach thu)) nang xa hoi. lieu va cac tuc va ((hanh hai) OR (nhanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach thu)) nang xa hoi. lieu va cac tuc va ((hanh hai) OR (nhanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach thu)) nang xa hoi. lieu va cac tuc va ((hanh hai) OR (nhanh hai)) cua tre*.