Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, phong chong
hanh trinh » canh tranh, hanh chinh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
trinh cua » tinh cua, trinh luat, trinh quan
doc hieu » toc thieu, hoc thieu, hoc hien
toan tap » toan ban
toan cao » toan ban

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 tinh - hanh trinh cua ((thong cong) or (thong thong)) dan ((toan tap) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh trinh cua ((thong cong) OR (thong thong)) dan ((toan tap) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trinh cua ((thong cong) or (thong thong)) dan ((toan tap) or (toan cao))*.