Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nam tuc » nam thuc, nam truc, nam tu
tuc gia » tac gia, duc gia, toc gia
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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 ((o hoi) OR (co hoi)). hieu van nam tuc gia thanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((o hoi) OR (co hoi)). hieu van nam tuc gia thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) OR (co hoi)). hieu van nam tuc gia thanh dai cua te*.