Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
cao hoi » co hoi, cao hoc, tao hoi
ty nang » ky nang, ty xang, ty hang
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: tu sach ty nang ((cao hoi) or (cau hoi)). ((hieu ve) or (hieu van)) cam duc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((cao hoi) OR (cau hoi)). ((hieu ve) OR (hieu van)) cam duc va tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((cao hoi) or (cau hoi)). ((hieu ve) or (hieu van)) cam duc va tinh di cua tre*.