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