Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
hanh cong » thanh cong, hang cong, hanh dong
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
day hanh » day nhanh, day thanh, dao hanh
cong cua » cong cu, dong cua, huong cua
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty lang xa hoi. hieu van ((nam thuoc) OR (nam thu)) day hanh cong cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty lang xa hoi. hieu van ((nam thuoc) OR (nam thu)) day hanh cong cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu van ((nam thuoc) OR (nam thu)) day hanh cong cua tre*.