Perhaps you should try some spelling variations:
canh khoa » anh khoa, xanh khoa, doanh khoa
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
khoa hoc » hoa hoc
hai quan » tac quan
nhan tai » hang tai, van tai, toan tai
hai van » thai van, ha van, hai tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu dong luc canh khoa hoc cua ((hai van) or (hai quan)) nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu dong luc canh khoa hoc cua ((hai van) OR (hai quan)) nhan tai.
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu dong luc canh khoa hoc cua ((hai van) or (hai quan)) nhan tai*.