Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc dan » thuoc dang, thuc dan, thuoc ban
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
dan lanh » dan canh, dan hanh, dat lanh
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
sach ly » sach y, sach lo, sach hay
sach ty » sach y, sach tu, sach thu
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ly) or (sach ty)) nang ((ma hoi) or (xa hoi)). hieu van nam thuoc dan lanh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) nang ((ma hoi) OR (xa hoi)). hieu van nam thuoc dan lanh hai cau treo.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) nang ((ma hoi) or (xa hoi)). hieu van nam thuoc dan lanh hai cau treo*.