Perhaps you should try some spelling variations:
tuan cong » thuan cong, luan cong, tran cong
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
dinh cuu » dinh chi
van hanh » van thanh, ban hanh, van anh
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
ca danh » cao danh, cau danh, va danh
thi van » thi lan, thi nang
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
ca dan » cac dan, ca dao
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hanh va hoi. thi van tuan cong ((((ca danh) or (ca dan))) or (van hanh)) dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh va hoi. thi van tuan cong ((((ca danh) OR (ca dan))) OR (van hanh)) dinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh va hoi. thi van tuan cong ((((ca danh) or (ca dan))) or (van hanh)) dinh cuu tre*.