Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
cau treo » cau theo, cau tren, cau triet
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, thien van, lieu va
lam tuc » lam truoc, luat tuc, nam thuc
hai cau » hai chau, hai chu, hai hau
va danh » va dinh, va dan, va hanh
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
nang ma » tang ma, sang ma, 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: vu sach tu ((nang ma) or (nang cao)) hoi. hieu van ((lam tuc) OR (lam thuoc)) va danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu ((nang ma) OR (nang cao)) hoi. hieu van ((lam tuc) OR (lam thuoc)) va danh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu ((nang ma) or (nang cao)) hoi. hieu van ((lam tuc) OR (lam thuoc)) va danh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: vu sach tu ((nang ma) or (nang cao)) hoi. hieu van ((lam tuc) OR (lam thuoc)) va danh hai cau treo*.