Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
te sach » toc sach
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
cuu tre » cau tren, cau treo
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
va cau » van cau, va cac, va dau

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

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