Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
hoi nang » hoi lang, ho nang, hoa nang
qua cham » qua hai, qua cac, va cham
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
dua tren » dung tren
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
soc van » hoc van, oc van, sac van
cuu tre » cua tre, cau tren, cau treo

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 hoi nang xa hoi. hieu qua cham soc van hanh hai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi nang xa hoi. hieu qua cham soc van hanh hai ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoi nang xa hoi. hieu qua cham soc van hanh hai ((dua tren) or (cuu tre))*.