Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va manh » van manh, va danh, va hanh
hai cau » hai chau, hai chu, hoi cau
hai hau » hai chau, dai hau, hai hai

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 xa hoi. hieu van cam thuc va manh ((hai cau) OR (hai hau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van cam thuc va manh ((hai cau) OR (hai hau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van cam thuc va manh ((hai cau) OR (hai hau)) treo*.