Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
va hanh » van hanh, va danh, ban hanh
cam loc » cam lo
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ca cua » co cua
ve cam » ve cham, ve cac, va cam

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