Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cam luc » cam xuc
nang xa » lang xa, nang ma, mang xa
di cua » dai cua, doi cua, de cua
cua su » qua su

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 ((nang xa) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) va hang di cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam luc) OR (cau luc)) va hang di cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) va hang di cua su".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) va hang di cua su*.