Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
sach v » sach va, sach 2, sach vay
va cao » va cac, va co, va dao
va dan » ca dan, va dao, va dau
dan du » dan dau, danh du, dan su
du dau » tu dau, dung dau

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 v) or (sach y)) nang xa hoi. hieu va cao duc va dan du dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach y)) nang xa hoi. hieu va cao duc va dan du dau tren.
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach y)) nang xa hoi. hieu va cao duc va dan du dau tren*.