Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hanh ca » hanh cac, hanh cat, hanh cua
hieu va » lieu va
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2
cac tu » cac thu, cach tu, cac du
tu van » tu va
v nang » va nang, vu nang, van nang
ca cuu » cap cuu, cua cuu, ca cua

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 v nang ((le hoi) or (ma hoa)). ((hieu va) or (hieu qua)) cac tu van hanh ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((le hoi) OR (ma hoa)). ((hieu va) OR (hieu qua)) cac tu van hanh ca cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((le hoi) or (ma hoa)). ((hieu va) or (hieu qua)) cac tu van hanh ca cuu tre*.