Perhaps you should try some spelling variations:
trinh vatp » trinh van, trinh va, trinh lap
thong cong » trong cong, tong cong, thong thong
trinh vat » trinh van, trinh luat, sinh vat
manh toan » thanh toan, anh tuan, tinh toan
hien anh » hien hanh, thien anh, dien anh
dan than » dan chan, ban than, van than

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 anh - hanh ((trinh vatp) or (trinh vat)) thong cong ((manh toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien anh - hanh ((trinh vatp) OR (trinh vat)) thong cong ((manh toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien anh - hanh ((trinh vatp) or (trinh vat)) thong cong ((manh toan) or (dan than)) cau*.