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