Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh duc » minh duc, ninh duc, tinh duc
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau treo
va cam » va cham, va cac, va cao
loc va » hoc va
luc va » duc va, tuc va

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 ty nang xa hoi. hieu va cam ((loc va) or (luc va)) dinh duc ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu va cam ((loc va) OR (luc va)) dinh duc ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu va cam ((loc va) or (luc va)) dinh duc ((cuu tre) or (cau tren))*.