Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
trinh ven » trinh van, trinh ve, trinh den
trinh vi » trinh va, trinh ve, trinh viet
cong tap » cuong tap, cong tac, cong tan
doan cao » doanh cao, doan cap, hoang cao
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh ((trinh vi) or (trinh ven)) thong cong tap ((doan cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh ((trinh vi) OR (trinh ven)) thong cong tap ((doan cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((trinh vi) or (trinh ven)) thong cong tap ((doan cao) or (toan cao))*.