Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
dang trong » dung trong, dong trong, lang trong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh cua » tinh cua, trinh luat, trinh luan
trong dan » trong dang, trong san, trong tan
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
ho chieu » theo chieu, hoc thieu, doi chieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (ho chieu)) tach - hanh ((trinh cua) or (trinh quan)) dang trong dan thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (ho chieu)) tach - hanh ((trinh cua) OR (trinh quan)) dang trong dan thanh cac.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (ho chieu)) tach - hanh ((trinh cua) or (trinh quan)) dang trong dan thanh cac*.