Perhaps you should try some spelling variations:
thong tuong » thong thuong, thong thong, thong duong
thiet hach » thien hach, thuyet hach, thiet hai
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua thong » cua thuong, cua khong, cua tong
tuong van » truong van, trong van, duong van
van manh » van minh, van anh, van hanh
van toan » van tuan, van tan, van thanh
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 - ((van manh) or (hoang minh)) cua thong tuong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((van manh) OR (hoang minh)) cua thong tuong van toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - ((van manh) or (hoang minh)) cua thong tuong van toan ban*.