Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
doan van » doan va, hoang van, luan van
luoc van » luoc can, luoc va, luc van
tu sach » su sach, te sach, tu cach
van cua » vang cua, ban cua, dan cua
luc vay » luc va, luc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet

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: ((tu sach) OR (thu sach)) ly nang xa hoi. hieu ve cham ((luc vay) OR (luoc van)) doan van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang xa hoi. hieu ve cham ((luc vay) OR (luoc van)) doan van cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang xa hoi. hieu ve cham ((luc vay) OR (luoc van)) doan van cua tre*.