Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
thuc dan » hoc dan, thuc vat
te sach » toc sach
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va can » va chan, va cac, va cao
va cua » va chua, via cua, ca cua
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 tru nang x hoi. hieu va can ((thuc dan) or (thuc hanh)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tru nang x hoi. hieu va can ((thuc dan) OR (thuc hanh)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tru nang x hoi. hieu va can ((thuc dan) or (thuc hanh)) hanh va cua tre*.