Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trang tuan » tran tuan, trung tuan, trong tuan
cong ngang » cong nhan, cong quang, cong lang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang qua » trong qua, trong quan, trung quan
cong vang » cong lang, cong quang, cong san
tay co » ty co, cay co, tay o

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 qua) or (trang tuan)) trong ((cong vang) OR (cong ngang)) tay co~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trang qua) OR (trang tuan)) trong ((cong vang) OR (cong ngang)) tay co.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh ((trang qua) or (trang tuan)) trong ((cong vang) OR (cong ngang)) tay co".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trang qua) or (trang tuan)) trong ((cong vang) OR (cong ngang)) tay co*.