Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
thu san » thuy san, thu ban, phu san
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tu ban » thu ban, te ban
va cua » va chua, via cua, ca cua

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