Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vanh dai » van dai, vanh tai, lanh dao
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau treo
va vanh » va van, va danh, va hanh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
ty nang » ky nang, ty xang, ty hang
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: te sach ty nang x hoi. ((hieu va) or (hieu qua)) cac duc va vanh dai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. ((hieu va) OR (hieu qua)) cac duc va vanh dai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. ((hieu va) or (hieu qua)) cac duc va vanh dai ((cuu tre) OR (cau tren))*".