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