Perhaps you should try some spelling variations:
luan trong » quan trong, luat trong, luan tuong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - hanh tang luan trong cong tan khan cap~.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh tang luan trong cong tan khan cap*.