Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
thu sac » thu sach, thu xac, thu dac
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cac lao » ca lao, cac loai, cac giao
cua tre » cua te, cuu tre, cua triet
thu san » thuy san, thu ban, phu san
hieu va » lieu va
lao va » tao va, cao va, bao va
x hoi » xa hoi, o hoi, x ho

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

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