Perhaps you should try some spelling variations:
sach nang » cach mang, sach dung, sach danh
tu tieng » luc tieng, tu tuong, tu trong
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
nang xa » nang x, lang xa, nang ma
sach ha » sach nha, sach han, sach xa
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach nang) or (sach ha)) nang xa hoi. hieu va cam xuc van hanh vi ((su triet) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach nang) OR (sach ha)) nang xa hoi. hieu va cam xuc van hanh vi ((su triet) OR (tu tieng)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach nang) or (sach ha)) nang xa hoi. hieu va cam xuc van hanh vi ((su triet) or (tu tieng))*.