Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
trong chuan » thong chuan, trong chan, trong thuan
hanh trong » hanh trang, anh trong, hinh trong
chuan nang » chua nang, chuan trang, chuc nang
hoc thien » hoc hien, hoc thieu, hoc thiet
cong tang » cong thang, cong lang, cong vang
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien thanh - hanh trong chuan nang ((cong tan) or (cong tang)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - hanh trong chuan nang ((cong tan) OR (cong tang)) phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - hanh trong chuan nang ((cong tan) or (cong tang)) phan cau*.