Perhaps you should try some spelling variations:
thien van » thi van
lam truc » lam truoc, nam truc, lam thuoc
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
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: tu ((sach y) or (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam truc va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach ty)) nang x hoi. ((hieu va) OR (thien van)) lam truc va tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam truc va tinh va cua tre*.