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
hap benh » hop benh, kham benh, phau benh
nhan tai » hang tai, van tai, toan tai
hoc anh » hoc nganh, hoc nhanh, hoc sinh
hoc xa » hoc ma
xa hap » xa hai

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 hap benh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien cuu tong ((hoc anh) OR (ngoc anh)) hoa hoc xa hap 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 hap benh nhan tai*.