Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
manh hai » lanh hai, minh hai, thanh hai
dang hai » dang khai, hang hai, dung hai
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa
van am » van nam, van lam, van dam

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 hoi. hieu van am thuc va ((manh hai) or (dang hai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu van am thuc va ((manh hai) OR (dang hai)) cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu van am thuc va ((manh hai) or (dang hai)) cau tren*.