Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trang tuan » tran tuan, trung tuan, trong tuan
cong quang » luong quang, thong quang, duong quang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang qua » trong qua, trong quan, trung quan
cong vang » cong lang, cong ngang, cong san
tay cao » tao cao, tay co, toan cao

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 quang)) tay cao~.
• 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 quang)) tay cao*.
• 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 quang)) tay cao*".