Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
van toan » van tuan, van tan, van thanh
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: ((hoc thien) or (hoc thiet)) hach - hanh trinh va ((nhung cong) OR (dung cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thiet)) hach - hanh trinh va ((nhung cong) OR (dung cong)) van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) or (hoc thiet)) hach - hanh trinh va ((nhung cong) OR (dung cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) or (hoc thiet)) hach - hanh trinh va ((nhung cong) OR (dung cong)) van toan cao*.