Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, lieu va, hieu ve
chat soc » cham soc, chat hoc, chat doc
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
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 ky ((lang xa) or (lang van)) hoi. ((hieu van) or (thien van)) chat soc va hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (lang van)) hoi. ((hieu van) OR (thien van)) chat soc va hanh dai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang van)) hoi. ((hieu van) or (thien van)) chat soc va hanh dai cua vat*.