Perhaps you should try some spelling variations:
thuoc dang » thuoc dung, thuoc khang, thuc dan
dang thanh » dong thanh, dang hanh, hoang thanh
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
lang ha » long ha
doi cua » hoi cua
ha hoi » hoa hoi, ha noi, xa hoi

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 ky) or (sach y)) lang ha hoi. hieu van nam thuoc dang thanh ((doi cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) lang ha hoi. hieu van nam thuoc dang thanh ((doi cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach y)) lang ha hoi. hieu van nam thuoc dang thanh ((doi cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) lang ha hoi. hieu van nam thuoc dang thanh ((doi cua) OR (dai cua)) tre*.