Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu sach » chieu sach, thien hach, hieu cach
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
tnhan tai » toan tai, nhan tao, han tai
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
nhan tai » hang tai, van tai, toan 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 ((thieu sach) or (thien thanh)) - canh tranh qua dung cong dan ((tnhan tai) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien thanh)) - canh tranh qua dung cong dan ((tnhan tai) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien thanh)) - canh tranh qua dung cong dan ((tnhan tai) or (nhan tai))*.