Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky
cac bo » bac bo, cac co
bo va » bao va, do va, so 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 nang xa hoi. ((hieu va) or (hieu qua)) cac bo va hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang xa hoi. ((hieu va) OR (hieu qua)) cac bo va hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: thu san ky nang xa hoi. ((hieu va) or (hieu qua)) cac bo va hanh than cua tre*.