Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
tu sach » thu sach, te sach, tu cach
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
va cua » va chua, via cua, ca cua
ve cai » va cai, ve cac, ve tai

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) OR (su sach)) ty nang cau hoi. hieu ((ve cai) or (ve cham)) ly va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang cau hoi. hieu ((ve cai) OR (ve cham)) ly va danh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang cau hoi. hieu ((ve cai) or (ve cham)) ly va danh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang cau hoi. hieu ((ve cai) or (ve cham)) ly va danh va cua tre*.