Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cong ngoc » cong ngo, hoang ngoc, cuong ngon
hang khoa » dung khoa
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
anh khoa » doanh khoa
hoi danh » hop danh, hoi dan, hoc danh
nhan tai » hang tai, van tai, toan tai
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach hoc tap, nghien cuu cong ngoc ((anh khoa) OR (hang khoa)) hoc xa hoi danh nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach hoc tap, nghien cuu cong ngoc ((anh khoa) OR (hang khoa)) hoc xa hoi danh nhan tai".
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu cong ngoc ((anh khoa) OR (hang khoa)) hoc xa hoi danh nhan tai*.