Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
lam truoc » nam truoc, lam truong, nam thuoc
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
va lanh » va lang, va danh, va hanh
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may

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 ((nang ma) or (sang ma)) hoi. hieu van ((lam truoc) OR (lam thuoc)) va lanh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang ma) OR (sang ma)) hoi. hieu van ((lam truoc) OR (lam thuoc)) va lanh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((nang ma) or (sang ma)) hoi. hieu van ((lam truoc) OR (lam thuoc)) va lanh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang ma) or (sang ma)) hoi. hieu van ((lam truoc) OR (lam thuoc)) va lanh hai cau treo*.