Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
hang x » nang x, hoang xa, chang xu
cau tu » dau tu
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: thu sach ty hang x hoi. hieu van ((cau truc) or (cau tu)) va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty hang x hoi. hieu van ((cau truc) OR (cau tu)) va hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ty hang x hoi. hieu van ((cau truc) or (cau tu)) va hanh tai cua te*.