Perhaps you should try some spelling variations:
hoang hai » hoang thi, hoang van
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
hang hai » hang tai, thanh hai, hang va
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
van am » van nam, van lam, van dam
ma hoi » mai hoi, xa hoi, ma hoa

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

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