Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, nam thu, nam tu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
vi cuu » vi luu, vinh cuu

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 y nang x ho. ((hieu va) or (thien van)) ((nam thuc) OR (am thuc)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. ((hieu va) OR (thien van)) ((nam thuc) OR (am thuc)) van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x ho. ((hieu va) or (thien van)) ((nam thuc) OR (am thuc)) van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. ((hieu va) or (thien van)) ((nam thuc) OR (am thuc)) van hanh vi cuu tre*.