Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh dung » thanh duong, thanh tung, thanh hung
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
phan cong » thanh cong
toan lap » toan tap, toan lao, thanh lap
phan lap » phan dau

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 - thanh dung ((phan xuong) OR (phan cong)) cong thanh ((toan lap) OR (phan lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh dung ((phan xuong) OR (phan cong)) cong thanh ((toan lap) OR (phan lap))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh dung ((phan xuong) OR (phan cong)) cong thanh ((toan lap) OR (phan lap))*.