Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
te sach » toc sach
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ((y nang) or (ky nang)) ma hoi. hieu van cac duc va thanh dai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) ma hoi. hieu van cac duc va thanh dai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (ky nang)) ma hoi. hieu van cac duc va thanh dai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (ky nang)) ma hoi. hieu van cac duc va thanh dai ((cuu tre) OR (cau treo))*.