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