Perhaps you should try some spelling variations:
thien van » thi van
lam truc » lam truoc, nam truc, lam thuoc
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di 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: thu ((sach ky) OR (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam truc va tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang x hoi. ((hieu va) OR (thien van)) lam truc va tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam truc va tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam truc va tinh vi cua tre*.