Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
dau hoi » cau hoi, dai hoi, dan hoi
ty nang » ky nang, ty xang, ty hang
ve cai » va cai, ve cac, ve tai
va cua » va chua, via cua, ca 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 ty nang dau hoi. hieu ((ve cai) or (ve cham)) ly ((va danh) OR (va hanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang dau hoi. hieu ((ve cai) OR (ve cham)) ly ((va danh) OR (va hanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang dau hoi. hieu ((ve cai) or (ve cham)) ly ((va danh) OR (va hanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang dau hoi. hieu ((ve cai) or (ve cham)) ly ((va danh) OR (va hanh)) va cua tre*.