Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hai chau » lai chau, ha chau, hat chau
cam thuc » am thuc, nam thuc, cam thu
hoi cau » hoi chu, hoc cau, hoa cau
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 vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
van cam » van nam, van lam, van cau
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 (ly vang)) ma hoi. hieu van cam thuc va danh ((hoi cau) or (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly nang) OR (ly vang)) ma hoi. hieu van cam thuc va danh ((hoi cau) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly nang) OR (ly vang)) ma hoi. hieu van cam thuc va danh ((hoi cau) or (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly nang) OR (ly vang)) ma hoi. hieu van cam thuc va danh ((hoi cau) or (hai chau)) treo*.