Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dang xay » dang van, van xay
cau treo » cau theo, cau triet, cau trieu
va hanh » van hanh, va thanh, va danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach ty)) dang xay hoi. hieu ve cac tu va hanh vi ((cau treo) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) dang xay hoi. hieu ve cac tu va hanh vi ((cau treo) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sach ty)) dang xay hoi. hieu ve cac tu va hanh vi ((cau treo) OR (cau tren))*".