Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
luu van » cuu van, luan van, luu hanh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, va cam, ve cai
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
ve cac » va cac, vien cac

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 ty nang xa hoi. hieu ((ve cam) or (ve cac)) ((luc va) or (luu van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) ((luc va) OR (luu van)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((ve cam) or (ve cac)) ((luc va) or (luu van)) hanh vi cua tre*.