Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
ngoc anh » ngu anh
hop benh » hoc benh, hap benh, hoa benh
nhan tai » hang tai, van tai, toan tai
hoc anh » hoc nganh, hoc nhanh, hoc sinh
hoc xa » hoc ma
xa hop » xa hoi, va hop, xa hoa

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 tong ((hoc anh) OR (ngoc anh)) hoa hoc xa hop benh nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach hoc tap, nghien cuu tong ((hoc anh) OR (ngoc anh)) hoa hoc xa hop benh nhan tai".
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu tong ((hoc anh) OR (ngoc anh)) hoa hoc xa hop benh nhan tai*.