Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
toc sach » hoc sach, doc sach, thuoc sach
kho tang » cao tang
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
cho cay » cho cac, cho vay, cho can
qua cac » cua cac
tang xa » trang xa, tang ma, lang xa
cho ca » cho cac, cho can, cho cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) kho tang xa hoi. hieu qua cac nuoc va thanh ((cho ca) OR (cho cay)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) kho tang xa hoi. hieu qua cac nuoc va thanh ((cho ca) OR (cho cay)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) kho tang xa hoi. hieu qua cac nuoc va thanh ((cho ca) OR (cho cay)) tre*.