Perhaps you should try some spelling variations:
sach ly » sach lo, sach ty, sach hay
vang xa » lang xa, mang xa, ang xa
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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) OR (sach y)) vang xa hoi. hieu qua cac duc van anh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ly) OR (sach y)) vang xa hoi. hieu qua cac duc van anh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ly) OR (sach y)) vang xa hoi. hieu qua cac duc van anh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ly) OR (sach y)) vang xa hoi. hieu qua cac duc van anh ((vai cua) or (hai cua)) tre*.