Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tang luan » dung luan
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
hang ca » hang va, nang cao, hang tai

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) or (hoc thiet)) danh - hanh ((tang luan) or (hang ca)) nhung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thiet)) danh - hanh ((tang luan) OR (hang ca)) nhung cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) or (hoc thiet)) danh - hanh ((tang luan) or (hang ca)) nhung cong tan toan cao*.