Perhaps you should try some spelling variations:
manh truong » manh trung, manh tuong, anh truong
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
nhung dung » phuong dung, ung dung, thong dung
truong va » truong dai, truong cao, truong dao
dung manh » duong manh, dung danh, hung manh
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 tach) or (thuat tach)) - manh truong va nhung dung manh ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - manh truong va nhung dung manh ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) or (thuat tach)) - manh truong va nhung dung manh ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat tach)) - manh truong va nhung dung manh ((toan tap) OR (toan ban))*.