Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
cau luc » cau truc, cau phuc
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam luc » cam xuc
lang di » lang dai, hang di, lang du
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: ((thu sach) OR (thuoc sach)) vu 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: ((thu sach) OR (thuoc sach)) vu 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: "((thu sach) OR (thuoc sach)) vu nang xa hoi. hieu ve ((cam luc) or (cau luc)) va lang di cua cu".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) vu nang xa hoi. hieu ve ((cam luc) or (cau luc)) va lang di cua cu*.