Perhaps you should try some spelling variations:
nang lai » nang tai, nang cai, nang hai
hanh via » hanh vi, hanh va, anh va
mang lai » mang lam, mang luoi, dang loai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va bao » va bai
bo va » bao va, do va, co va
so va » so van, so vat, su 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 ((nang lai) OR (mang lai)) hoi. hieu va bao ((bo va) or (so va)) hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang lai) OR (mang lai)) hoi. hieu va bao ((bo va) OR (so va)) hanh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang lai) OR (mang lai)) hoi. hieu va bao ((bo va) or (so va)) hanh via cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang lai) OR (mang lai)) hoi. hieu va bao ((bo va) or (so va)) hanh via cua tre*.