Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
cong tinh » cong trinh, cong vinh, long tinh
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
toan tap » toan 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 - hanh ((tang cua) or (hang cua)) dung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((tang cua) OR (hang cua)) dung cong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((tang cua) or (hang cua)) dung cong tinh toan tap*.