Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
thong dan » thong van, tuong dan, trong dan
thong den » thong dien, tuong den, thong dieu
anh nang » ganh nang, anh bang, anh dang
than cao » toan cao, thai cao, than cap
suat » xuat, luat, sua

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - anh nang suat thong ((thong dan) OR (thong den)) than cao~".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - anh nang suat thong ((thong dan) OR (thong den)) than cao*.