Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong vinh » cong trinh, trong vinh, cong viec
toan tai » doanh tai, toan cao, von tai
toan ban » van ban

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 tranh cua nhung cong vinh ((((toan tai) or (toan tap))) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - hanh tranh cua nhung cong vinh ((((toan tai) OR (toan tap))) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - hanh tranh cua nhung cong vinh ((((toan tai) or (toan tap))) or (toan ban))*.