Perhaps you should try some spelling variations:
thanh ket » thanh ke, hanh kem, thanh dat
va trien » va truyen, va thiet, va tuyen
truc va » thuc va, thuc vat, trung va
sach ky » sac ky, sach y, sach ty
te sach » toc sach
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
tuc va » thuc va, tuc xa, 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 (tay hoi)). lieu va cam ((tuc va) OR (truc va)) thanh ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((xay hoi) OR (tay hoi)). lieu va cam ((tuc va) OR (truc va)) thanh ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((xay hoi) or (tay hoi)). lieu va cam ((tuc va) OR (truc va)) thanh ket va trien".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((xay hoi) or (tay hoi)). lieu va cam ((tuc va) OR (truc va)) thanh ket va trien*.