Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
danh dai » danh dau, danh sai, vanh dai
danh di » danh du, xanh di, danh dien
tu sach » su sach, te sach, tu cach
ca viet » va viet, co viet, hoa viet
nang xa » nang x, lang xa, nang ma
soc va » hoc va, loc va, doc va
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van cham soc va ((danh dai) or (danh di)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van cham soc va ((danh dai) OR (danh di)) ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu van cham soc va ((danh dai) or (danh di)) ca viet*".