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