Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
danh thanh » dinh thanh, dang thanh, nhanh thanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
duong dao » luong dao, truong dao, huong dan
cong danh » cuong danh, cong dan, cong thanh
thanh lap » thanh san, phan lap, thanh hai
dong dao » dong dat, dong giao, dong co
tung va » trung va, tuong va, dung va

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 ((tung va) or (((duong dao) OR (dong dao)))) nhung cong danh thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh ((tung va) OR (((duong dao) OR (dong dao)))) nhung cong danh thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh ((tung va) or (((duong dao) OR (dong dao)))) nhung cong danh thanh lap".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh ((tung va) or (((duong dao) OR (dong dao)))) nhung cong danh thanh lap*.