Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
danh dau » lanh dao, hang dau, danh tu
hieu van » hieu va, lieu va, hieu ve
chat soc » cham soc, chat hoc, chat doc
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va dan, va hanh
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
soc va » hoc va, loc va, doc va

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)) ky nang xa hoi. ((hieu van) or (thien van)) chat soc va danh dau cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. ((hieu van) OR (thien van)) chat soc va danh dau cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang xa hoi. ((hieu van) or (thien van)) chat soc va danh dau cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang xa hoi. ((hieu van) or (thien van)) chat soc va danh dau cua viet*.