Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
trinh han » trinh quan
han tap » han tai, toan tap, nhan tai

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 ((trang cua) or (tranh cua)) nhung cong trinh han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trang cua) OR (tranh cua)) nhung cong trinh han tap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trang cua) or (tranh cua)) nhung cong trinh han tap*.