Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nganh hai
nang dau » hang dau, xang dau, nang du
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
nhanh ha » thanh hoa, thanh hai, khanh hoa
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
dau ha » dam ha, dau va, cau ha
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang dau ha. hieu van pham duc va ((nhanh hai) OR (nhanh ha)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang dau ha. hieu van pham duc va ((nhanh hai) OR (nhanh ha)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang dau ha. hieu van pham duc va ((nhanh hai) OR (nhanh ha)) ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang dau ha. hieu van pham duc va ((nhanh hai) OR (nhanh ha)) ((cua tre) or (cua te))*.