Perhaps you should try some spelling variations:
hoc nghien » hoc hien
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hoc khien » hoc hien, hoc thieu, hoc vien
manh toan » thanh toan, anh tuan, tinh toan
tranh va » tranh van, trang va, trinh va
van tuan » van quan, van ban, anh tuan

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

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