Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nang cong » nang song, dang cong, bang cong
dung thi » dung tri, dung chi, dung thu
cong anh » cong danh, dong anh, hong anh
tuan tap » toan tap, tuan 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: theo chieu sach - nhanh ((dung thi) OR (dung tai)) nang cong anh ((tuan tap) or (tuyen tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - nhanh ((dung thi) OR (dung tai)) nang cong anh ((tuan tap) OR (tuyen tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - nhanh ((dung thi) OR (dung tai)) nang cong anh ((tuan tap) or (tuyen tap))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - nhanh ((dung thi) OR (dung tai)) nang cong anh ((tuan tap) or (tuyen tap))*.