Perhaps you should try some spelling variations:
thanh trung » thanh tung
thuat tach » thuat sach, thuat mach, thuat tac
cong quang » luong quang, thong quang, duong quang
hoc thuat » hoc thuyet, hoc thuc, hoc chat
cong vang » cong lang, cong ngang, cong san
trung va » truong va, trang va, trung ha
than cap » khan cap, thanh lap, thanh cac
han ap » han tap, khan ap, dan ap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat tach - thanh trung va nhung ((cong vang) or (cong quang)) ((than cap) or (han ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat tach - thanh trung va nhung ((cong vang) OR (cong quang)) ((than cap) OR (han ap)).
• Adding a wildcard symbol may retrieve word variants: hoc thuat tach - thanh trung va nhung ((cong vang) or (cong quang)) ((than cap) or (han ap))*.