Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, xa hoi, me hoi
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua

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 v nang ((ma hoi) OR (ma hoa)). hieu va cac loc ((va thanh) or (ban thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((ma hoi) OR (ma hoa)). hieu va cac loc ((va thanh) OR (ban thanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((ma hoi) OR (ma hoa)). hieu va cac loc ((va thanh) or (ban thanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((ma hoi) OR (ma hoa)). hieu va cac loc ((va thanh) or (ban thanh)) di cua tre*.