Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
te sach » toc sach
cac duc » cac du, cao duc, cac dac
dat cua » dai cua, day cua, mat cua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
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: te sach ty nang ((ma hoi) or (xa hoi)). hieu ve cac duc ((va thanh) OR (va tinh)) dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((ma hoi) OR (xa hoi)). hieu ve cac duc ((va thanh) OR (va tinh)) dat cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((ma hoi) or (xa hoi)). hieu ve cac duc ((va thanh) OR (va tinh)) dat cua tre*".