Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
day hanh » day nhanh, day thanh, day manh
dao hanh » dao thanh, dang hanh, ban hanh
cong cua » cong cu, dong cua, huong cua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
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: toc sach y lang xa hoi. hieu van nam thuoc ((day hanh) or (dao hanh)) cong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang xa hoi. hieu van nam thuoc ((day hanh) OR (dao hanh)) cong cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y lang xa hoi. hieu van nam thuoc ((day hanh) or (dao hanh)) cong cua tre*.