Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sai » thu hai, thu tai, thu san
va cham » va chat, va tham
hanh va » hang va, hanh vi
loc van » luoc van, hoc van, lo van
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
va cam » va cac, va cao, va cai
ma hoi » mai hoi, xa hoi, me hoi
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 sai ky nang ((ma hoi) or (ma hoa)). lieu ((va cam) OR (va cham)) loc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang ((ma hoi) OR (ma hoa)). lieu ((va cam) OR (va cham)) loc van hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang ((ma hoi) or (ma hoa)). lieu ((va cam) OR (va cham)) loc van hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang ((ma hoi) or (ma hoa)). lieu ((va cam) OR (va cham)) loc van hanh va cua tre*.