Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu tach » hieu cach, chiet tach, chieu sach
trinh vit » trinh viet, trinh vat, trinh vuot
tai thanh » thi thanh, tai chinh, ban thanh
doc hieu » toc thieu, hoc thieu, hoc hien
trinh vi » trinh va, trinh ve, trinh viet
cong tai » cong thai, cong tac, dong tai
thanh tu » hanh tu, nhanh tu, thanh tung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tach - canh ((trinh vi) or (trinh vit)) thong cong tai thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tach - canh ((trinh vi) OR (trinh vit)) thong cong tai thanh tu.
• Adding a wildcard symbol may retrieve word variants: doc hieu tach - canh ((trinh vi) or (trinh vit)) thong cong tai thanh tu*.