Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, cach thuc
sach tham » sach nha
hieu van » hieu va, thien van, lieu va
nam xuc » cam xuc, nam xua, nam thuc
xuc ban » duc ban, cuc ban, quoc ban
ban ban » ban banh, van ban, can ban
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach thue) OR (sach tham)) nang x hoi. hieu van nam xuc ban ban va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thue) OR (sach tham)) nang x hoi. hieu van nam xuc ban ban va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach thue) OR (sach tham)) nang x hoi. hieu van nam xuc ban ban va ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thue) OR (sach tham)) nang x hoi. hieu van nam xuc ban ban va ((cua tre) or (cua te))*.