Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc trieu » hoc thieu, hoc tieu, hoc dieu
tang vatn » tang van, dang van, lang van
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
tang vat » tang van, dang vat, bang vat
toan ban » van ban
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc trieu tinh - hanh ((tang vat) or (((tang vatn) OR (tan van)))) nhung cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc trieu tinh - hanh ((tang vat) OR (((tang vatn) OR (tan van)))) nhung cong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc trieu tinh - hanh ((tang vat) or (((tang vatn) OR (tan van)))) nhung cong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc trieu tinh - hanh ((tang vat) or (((tang vatn) OR (tan van)))) nhung cong manh toan ban*.