Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
tinh voi » trinh voi, tinh doi, binh voi
lam truc » lam truoc, nam truc, lam thuoc
voi cua » hoi cua, doi cua, moi cua
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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 xa) or (nang ma)) hoi. ((hieu ve) or (thien van)) lam truc va tinh voi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (thien van)) lam truc va tinh voi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (nang ma)) hoi. ((hieu ve) or (thien van)) lam truc va tinh voi cua tre*.