Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, lieu va, hieu ve
cam thuc » am thuc, nam thuc, cam thu
hai cau » hai chau, hai chu, hai hau
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
ly nang » ly hang, ly vang, ly quang
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: vu sach ((ly nang) OR (ky nang)) ma hoi. ((hieu van) or (thien van)) cam thuc va danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly nang) OR (ky nang)) ma hoi. ((hieu van) OR (thien van)) cam thuc va danh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly nang) OR (ky nang)) ma hoi. ((hieu van) or (thien van)) cam thuc va danh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly nang) OR (ky nang)) ma hoi. ((hieu van) or (thien van)) cam thuc va danh hai cau treo*.