Perhaps you should try some spelling variations:
kham chua » kham pha
hanh viet » danh viet, hang viet, hanh tiet
chua ban » chua bang, cua ban, chua dan
han viet » san viet, van viet, dan viet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
cua tre » cua te, cuu tre, cua triet
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 va kham chua ban ((anh viet) or (((hanh viet) OR (han viet)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va kham chua ban ((anh viet) OR (((hanh viet) OR (han viet)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va kham chua ban ((anh viet) or (((hanh viet) OR (han viet)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va kham chua ban ((anh viet) or (((hanh viet) OR (han viet)))) cua tre*.