Perhaps you should try some spelling variations:
nhanh ha » thanh hoa, thanh hai, khanh hoa
dang xay » dang van
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van bac » van ban, van bao, van hac
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
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 ty ((dang xay) OR (van xay)) hoi. hieu van bac xuc va ((hanh hai) or (nhanh ha)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((dang xay) OR (van xay)) hoi. hieu van bac xuc va ((hanh hai) OR (nhanh ha)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((dang xay) OR (van xay)) hoi. hieu van bac xuc va ((hanh hai) or (nhanh ha)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang xay) OR (van xay)) hoi. hieu van bac xuc va ((hanh hai) or (nhanh ha)) cua tre*.