Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, dan ky, ban ky
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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

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