Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
cam truc » cau truc, nam truc, lam truoc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang xa hoi. ((hieu ve) or (hieu va)) cam truc ((van hanh) OR (van anh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. ((hieu ve) OR (hieu va)) cam truc ((van hanh) OR (van anh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. ((hieu ve) or (hieu va)) cam truc ((van hanh) OR (van anh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu ve) or (hieu va)) cam truc ((van hanh) OR (van anh)) di cua tre*.