Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
luc van » luoc van, luu van, duc van
xuc ban » duc ban, cuc ban, quoc ban
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu lang) or (xu lang)) xa hoi. hieu vu cham ((xuc ban) or (luc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu lang) OR (xu lang)) xa hoi. hieu vu cham ((xuc ban) OR (luc van)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) or (xu lang)) xa hoi. hieu vu cham ((xuc ban) or (luc van)) hanh vi cua tre*.