Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
trang tuan » tran tuan, trung tuan, trong tuan
trang qua » trong qua, trong quan, trung quan
cong vang » cong lang, cong quang, cong ngang
vang tay » vung tay, bang tay, mang tay
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) OR (thuat tach)) - hanh ((trang qua) or (trang tuan)) trong cong vang tay cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - hanh ((trang qua) OR (trang tuan)) trong cong vang tay cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thuat tach)) - hanh ((trang qua) or (trang tuan)) trong cong vang tay cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thuat tach)) - hanh ((trang qua) or (trang tuan)) trong cong vang tay cao*.