Perhaps you should try some spelling variations:
thien nang » thien bang, thien dang, trien nang
hoc thien » hoc hien, hoc thieu, hoc thiet
cua trung » cua truong, xuan trung, cua nhung
qua trong » quan trong, qua trinh, qua song
tan khang » van khang, tao khang, tinh khang
khang dau » hang dau, phan dau, xang dau
cong tan » cong tac, cong san, cong thanh

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 nang - cach mang ((cua trung) or (qua trong)) cong tan khang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien nang - cach mang ((cua trung) OR (qua trong)) cong tan khang dau*.