Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vuc nang » cuc nang, chuc nang, van nang
cau luc » cau truc, cau phuc
vu nang » va nang, vu dang, v nang
lang di » lang dai, hang di, lang du
hieu ve » hieu va, hieu van
cam luc » cam xuc
va lang » va nang, hoa lang
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((vu nang) OR (vuc nang)) xa hoi. hieu ve ((cam luc) or (cau luc)) va lang di cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((vu nang) OR (vuc nang)) xa hoi. hieu ve ((cam luc) OR (cau luc)) va lang di cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((vu nang) OR (vuc nang)) xa hoi. hieu ve ((cam luc) or (cau luc)) va lang di cua cu".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((vu nang) OR (vuc nang)) xa hoi. hieu ve ((cam luc) or (cau luc)) va lang di cua cu*.