Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
cong ngang » cong nhan, cong lang, cong nong
cong quang » luong quang, thong quang, duong quang
dieu tinh » diep tinh, lieu tinh, dien tinh
hoc dieu » hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
thuat do » thuat o
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu tinh - hanh trung va dung ((cong ngang) or (cong quang)) thuat do~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu tinh - hanh trung va dung ((cong ngang) OR (cong quang)) thuat do*.