Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
vanh dai » van dai, vanh tai, lanh dao
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va vanh » va van, va danh, va hanh
cuu tre » cua tre, cau treo
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac tu » cac thu, cach tu, cac du
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 o hoi. lieu va ((cac nuoc) or (cac tu)) 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 o hoi. lieu va ((cac nuoc) OR (cac tu)) 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 o hoi. lieu va ((cac nuoc) or (cac tu)) va vanh dai ((cuu tre) OR (cau tren))*".