Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc day » thuc day, thuoc dac, thuoc dang
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
lang xa » dang xay, lang van
lang ha » long ha
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) OR (lang ha)) hoi. hieu van nam thuoc day hanh cong cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((lang xa) OR (lang ha)) hoi. hieu van nam thuoc day hanh cong cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((lang xa) OR (lang ha)) hoi. hieu van nam thuoc day hanh cong cua tre*.