Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
anh ve » hanh ve, anh va, anh viet
ve dau » va dau, ve du, ke dau

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 ky nang x ho. ((hieu ve) or (lieu va)) cham duc van anh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. ((hieu ve) OR (lieu va)) cham duc van anh ve dau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. ((hieu ve) or (lieu va)) cham duc van anh ve dau tren*.