Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hanh hai » thanh hai, hang hai, hanh tai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
nang xa » lang xa, nang ma, mang xa
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

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