Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cau tren » dau tren, ca tren, cau treo
thuoc va » thuc va, thuoc ma, thuong va
sach ky » sac ky, sach y, sach kem
dan van » dang van, doan van, dao van
cu tren » tu tren, dua tren
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
va dan » ca dan, va dao, va dau
va nam » van nam, ha nam, va nay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sach ty)) lang xa hoi. hieu va nam thuoc va dan van ((cau tren) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) or (sach ty)) lang xa hoi. hieu va nam thuoc va dan van ((cau tren) OR (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) or (sach ty)) lang xa hoi. hieu va nam thuoc va dan van ((cau tren) OR (cu tren))*.