Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, xuc ban
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
vi 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: su sach ty nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van thanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van thanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van thanh ((vi cua) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoi. hieu ((ve cam) OR (va cam)) xuc van thanh ((vi cua) or (vai cua)) tre*.