Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
thanh lam » thanh lap, hanh lam, thanh tam
pham duy » pham duc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
duy va » duy vat, duy van, day va
ma hoi » mai hoi, xa hoi, me hoi

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 tang ((ma hoi) or (ma hoa)). hieu vu pham duy va ((thanh lam) OR (thanh nam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang ((ma hoi) OR (ma hoa)). hieu vu pham duy va ((thanh lam) OR (thanh nam)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty tang ((ma hoi) or (ma hoa)). hieu vu pham duy va ((thanh lam) OR (thanh nam)) cua tre*".