Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu luc » hieu luat, hieu qua
luc cham » luc tham, tuc cham, phuc cham
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
soc va » hoc va, loc va, doc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y xang) OR (ty xang)) cao hoi. hieu luc cham soc va hanh va ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y xang) OR (ty xang)) cao hoi. hieu luc cham soc va hanh va ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y xang) OR (ty xang)) cao hoi. hieu luc cham soc va hanh va ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y xang) OR (ty xang)) cao hoi. hieu luc cham soc va hanh va ((cua te) or (cuu tre))*.