Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
tran thong » tran hong, tran trong, tran phong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong
phan cac » nhan cach, phan dau, phan lap

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 ((tran thong) or (toan thong)) cong lang phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh tung ((tran thong) OR (toan thong)) cong lang phan cac.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh tung ((tran thong) or (toan thong)) cong lang phan cac*.