Perhaps you should try some spelling variations:
lang noi » nang noi, dang noi, lang nui
noi khoa » ngoai khoa, hoc khoa, tai khoa
hoc sach » hoc sinh, hoc cac
hoc anh » hoc nganh, hoc nhanh, ngoc anh
ve pham » v pham, ve phan, ve phat
duc van » duc va, duc tan, duc manh
van han » van hanh, van phan, van nhan
han tai » hang tai, nhan tai, van tai
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
y lang » o lang, _ lang, tay lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) OR (hoc anh)) y lang noi khoa. hieu ((ve pham) or (vi pham)) duc van han tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) y lang noi khoa. hieu ((ve pham) OR (vi pham)) duc van han tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) y lang noi khoa. hieu ((ve pham) or (vi pham)) duc van han tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) y lang noi khoa. hieu ((ve pham) or (vi pham)) duc van han tai cuu tre*.