Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau treo
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
dau du » dau tu, day du, dao du
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. hieu va cam tuc va dau du ((((cuu tre) OR (cau tren))) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu va cam tuc va dau du ((((cuu tre) OR (cau tren))) OR (cau triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu va cam tuc va dau du ((((cuu tre) OR (cau tren))) or (cau triet))*".