Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
sach ly » sach y, sach lo, sach ty
ly lang » ly hang, ly vang, le lang
lang xa » lang ha, dang xay, lang van
cau duc » cao duc, cau luc, chu duc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly lang xa hoi. ((((hieu van) OR (thien van))) or (lieu va)) cau duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly lang xa hoi. ((((hieu van) OR (thien van))) OR (lieu va)) cau duc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly lang xa hoi. ((((hieu van) OR (thien van))) or (lieu va)) cau duc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ly lang xa hoi. ((((hieu van) OR (thien van))) or (lieu va)) cau duc va hanh vai cua tre*.