Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
dang hai » dang khai, hang hai, dung hai
hieu van » hieu va, thien van, lieu va
danh hai » lanh hai, manh hai, danh hau
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van lam » van nam
nang ma » tang ma, sang ma, nang cao
tuc va » truc va, tuc xa, duc va
ma hoi » mai hoi, xa hoi, ma hoa

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