Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
va kinh » va tinh, qua kinh
kinh ba » kinh bac, dinh ba, kinh va
co hoi » co hoc, co loi
ba va » bua va, ba vi, ba na
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu cach) or (tu cac))) or (su sach)) ky nang co hoi. hieu van cham duc va kinh ba va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu cach) OR (tu cac))) OR (su sach)) ky nang co hoi. hieu van cham duc va kinh ba va thiet.
• Adding a wildcard symbol may retrieve word variants: ((((tu cach) or (tu cac))) or (su sach)) ky nang co hoi. hieu van cham duc va kinh ba va thiet*.