Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
minh trang » tinh trang, minh hoang, minh tuan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua thong » cua thuong, cua khong, cua tong
thong dan » thong van, tuong dan, trong dan
thong den » thong dien, tuong den, thong dieu
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 - ((minh trang) or (canh tranh)) cua thong ((thong dan) OR (thong den)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((minh trang) OR (canh tranh)) cua thong ((thong dan) OR (thong den)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet hach - ((minh trang) or (canh tranh)) cua thong ((thong dan) OR (thong den)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - ((minh trang) or (canh tranh)) cua thong ((thong dan) OR (thong den)) toan ban*.