Perhaps you should try some spelling variations:
ganh hang » gan hang, ganh nang, tranh hang
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc ganh » hoc nganh, hoc anh, hoc hanh
hang hoa » hang khoa, thanh hoa, hang va
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
hoc bai » hoc dai, hoc giai
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc bai, nghien cuu dong hoc ganh hang hoa ((ma hoi) or (ma hoa)) ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc bai, nghien cuu dong hoc ganh hang hoa ((ma hoi) OR (ma hoa)) ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: te sach hoc bai, nghien cuu dong hoc ganh hang hoa ((ma hoi) or (ma hoa)) ca nhan dan*.