Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thi van » thi lan, thi hanh, thi nang
va hanh » van hanh, va danh, ban hanh
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
nam tu » nam thu, nam thuc
x hoi » xa hoi, o hoi, x ho
vi ca » vit ca, li ca, vi ha
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang x hoi. thi van nam tu ((va hanh) or (va thanh)) ((vi ca) OR (va ca)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x hoi. thi van nam tu ((va hanh) OR (va thanh)) ((vi ca) OR (va ca)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x hoi. thi van nam tu ((va hanh) or (va thanh)) ((vi ca) OR (va ca)) tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x hoi. thi van nam tu ((va hanh) or (va thanh)) ((vi ca) OR (va ca)) tren*.