Perhaps you should try some spelling variations:
hoc nghien » hoc hien
hoc nhiet » hoc thiet, hoc hien, hoc viet
quang cua » quan cua, quang tuan, quang huy
cua dong » chua dong, cua cong, cua dang
cong tap » cuong tap, cong tac, tong tap
cong tan » cong tac, cong san, cong thanh
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc nhiet) or (hoc nghien)) tach - nhanh quang cua dong ((cong tap) OR (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc nhiet) OR (hoc nghien)) tach - nhanh quang cua dong ((cong tap) OR (cong tan)) toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc nhiet) or (hoc nghien)) tach - nhanh quang cua dong ((cong tap) OR (cong tan)) toan ban*".