Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh van » thanh van, khanh van, hanh va
cham suc » cham soc, cham cuu, cao suc
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((tu nang) OR (tu nano)) xa hoi. hieu va cham suc manh ((hanh van) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tu nang) OR (tu nano)) xa hoi. hieu va cham suc manh ((hanh van) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu nang) OR (tu nano)) xa hoi. hieu va cham suc manh ((hanh van) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tu nang) OR (tu nano)) xa hoi. hieu va cham suc manh ((hanh van) or (hanh tai)) cua tre*.