Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cau » nang cao, hang cau, nang dau
chau tre » chay tren, chau tho, cho tre
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
thanh a » thanh ha, thanh va, thanh ba
a chau » ha chau, lai chau, hat chau

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 ty nang cau hoi. hieu va ((cham soc) or (cam xuc)) gia thanh a chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang cau hoi. hieu va ((cham soc) OR (cam xuc)) gia thanh a chau tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang cau hoi. hieu va ((cham soc) or (cam xuc)) gia thanh a chau tre*.