Perhaps you should try some spelling variations:
thien hach » thien thanh
nhung dung » phuong dung, ung dung, thong dung
hien sach » dien sach, kien sach, chieu sach
hien hanh » dieu hanh
quang cua » quan cua, quang tuan, quang huy
cua nhung » va nhung
dung dan » dung dat, dung san, tung dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (((thien hach) OR (hien hanh)))) - nhanh quang cua nhung dung dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (((thien hach) OR (hien hanh)))) - nhanh quang cua nhung dung dan than tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (((thien hach) OR (hien hanh)))) - nhanh quang cua nhung dung dan than tap*".