Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
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 thiet hach - hanh trinh va ((nhung cong) OR (thong cong)) van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet hach - hanh trinh va ((nhung cong) OR (thong cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - hanh trinh va ((nhung cong) OR (thong cong)) van toan cao*.