Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang dien » quang dien, dang dieu, nhan dien
dien qua » dien quan, dien cua, den qua
hieu ve » hieu va, hieu van
va hang » van hang, va nang, va lang
y nang » ky nang, ly nang, v nang
cam lo » cam ly, cam o
nam lo » nam bo, nam so, nam co
x hoi » xa hoi, o hoi, 5 hoi

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