Perhaps you should try some spelling variations:
thanh ket » thanh ke, hanh kem, thanh dat
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
te sach » toc sach
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
tuc va » thuc va, truc va, duc va
ket va » ket van
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ((xay hoi) OR (xa hoi)). lieu va cam ((tuc va) or (tuc xa)) thanh ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((xay hoi) OR (xa hoi)). lieu va cam ((tuc va) OR (tuc xa)) thanh ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((xay hoi) OR (xa hoi)). lieu va cam ((tuc va) or (tuc xa)) thanh ket va trien".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((xay hoi) OR (xa hoi)). lieu va cam ((tuc va) or (tuc xa)) thanh ket va trien*.