Perhaps you should try some spelling variations:
thuoc tai » nuoc tai, hoc tai, thuoc ma
va thanh » ban thanh, va tinh, le thanh
hieu van » hieu va, thien van, lieu va
xay hoi » xa hoi, tay hoi, cay phoi
van cau » van dau, van hau, van chat
ky danh » ky dang
cu tren » tu tren, dua tren
ky anh » ly anh, ty anh
de cu » de cua, de co, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc tai ((ky danh) or (ky anh)) xay hoi. hieu van cau truc ((va thanh) OR (gia thanh)) de cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc tai ((ky danh) OR (ky anh)) xay hoi. hieu van cau truc ((va thanh) OR (gia thanh)) de cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc tai ((ky danh) or (ky anh)) xay hoi. hieu van cau truc ((va thanh) OR (gia thanh)) de cu tren".
• Adding a wildcard symbol may retrieve word variants: thuoc tai ((ky danh) or (ky anh)) xay hoi. hieu van cau truc ((va thanh) OR (gia thanh)) de cu tren*.