Perhaps you should try some spelling variations:
thiet nang » nhiet nang, thien nang, thi nang
thong cong » trong cong, tong cong, phong chong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua
manh cua » doanh cua, ban cua
tac toan » tap toan, tam toan, hach toan
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 nang - hanh ((tranh cua) or (manh cua)) ((thong cong) OR (thong thong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet nang - hanh ((tranh cua) OR (manh cua)) ((thong cong) OR (thong thong)) tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet nang - hanh ((tranh cua) or (manh cua)) ((thong cong) OR (thong thong)) tac toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thiet nang - hanh ((tranh cua) or (manh cua)) ((thong cong) OR (thong thong)) tac toan ban*.