Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
tinh van » trinh van, dinh van, tinh va
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
van chu » van chi, van phu, van cau
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
co thuc » do thuc, co thua, mo thuc
tu nang » tru nang, tu nong, tu nano
chu tre » cho tre, chu tri, cuu tre
va co » vo co
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (((toc sach) or (hoc sach)))) tu nang x hoi. hieu va co thuc va tinh van chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((toc sach) OR (hoc sach)))) tu nang x hoi. hieu va co thuc va tinh van chu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((toc sach) or (hoc sach)))) tu nang x hoi. hieu va co thuc va tinh van chu tre*.