Perhaps you should try some spelling variations:
sach vay » sach va, sach hay, sach nay
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
du cau » cu cau, da cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach vay) or (sach y)) nang xa hoi. hieu va giao duc va danh du cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach vay) OR (sach y)) nang xa hoi. hieu va giao duc va danh du cau tren.
• Adding a wildcard symbol may retrieve word variants: toc ((sach vay) or (sach y)) nang xa hoi. hieu va giao duc va danh du cau tren*.