Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sang xa » song xa, lang xa, sang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
lai cua » hai cua, lai chau, thai cua
y sang » _ sang, duy sang

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 y sang xa hoi. ((hieu ve) or (hieu va)) cam duc van hanh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang xa hoi. ((hieu ve) OR (hieu va)) cam duc van hanh ((lai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y sang xa hoi. ((hieu ve) or (hieu va)) cam duc van hanh ((lai cua) or (dai cua)) tre*.