Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
lam tuc » lam thuoc, lam truoc, luat tuc
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang xa » lang xa, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 ky ((nang xa) OR (nang x)) hoi. ((hieu va) or (lieu va)) lam tuc va tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. ((hieu va) OR (lieu va)) lam tuc va tinh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang x)) hoi. ((hieu va) or (lieu va)) lam tuc va tinh vi cua tre*".