Perhaps you should try some spelling variations:
tranh cong » thanh cong, trinh cong, tran cong
hoc nhanh » hoc nganh, hoc phan
nhanh cay » nhanh ha, nhanh bac, nhanh va
cay khi » cac khi, cay phoi, chat khi
su sach » so sach
vu sach » vu bach, vu khach
cong ha » cong hoa, dong ha, cong tac
su hoc » tu hoc, du hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su hoc nhanh cay khi đong luc ) or ( ((su sach) OR (vu sach)) tranh cong ha đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su hoc nhanh cay khi đong luc ) OR ( ((su sach) OR (vu sach)) tranh cong ha đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su hoc nhanh cay khi đong luc ) or ( ((su sach) OR (vu sach)) tranh cong ha đong luc ))*".