Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam loc » cam lo
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang
loc va » hoc va, luc va
di qua » di cua, di quanh

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

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