Perhaps you should try some spelling variations:
trinh vatn » trinh van, trinh han, trinh san
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
tan chinh » tai chinh, lan chinh, tan thinh
van chinh » va chinh, lan chinh, van thinh
hoc dieu » hoc thieu, hoc hien
dieu can » dieu hanh, tiep can, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu can - hanh ((trinh vat) or (trinh vatn)) dung cong ((tan chinh) or (van chinh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu can - hanh ((trinh vat) OR (trinh vatn)) dung cong ((tan chinh) OR (van chinh)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc dieu can - hanh ((trinh vat) or (trinh vatn)) dung cong ((tan chinh) or (van chinh)) cau*.