Perhaps you should try some spelling variations:
nang duoc » ngang duoc, nang doc, nganh duoc
hanh via » hanh vi, hanh va, anh va
duoc hoi » quoc hoi, duoc hoc, duoc si
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
qua bao » qua ban, qua bau, qua lao
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
bao bo » bac bo, ban bo, nao bo
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) nang duoc hoi. hieu qua bao bo va hanh via ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang duoc hoi. hieu qua bao bo va hanh via ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang duoc hoi. hieu qua bao bo va hanh via ((cua tre) or (cuu tre))*.