Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hac thuc » hoc thuc, ha thuc, thach thuc
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach kem, sach hay
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((((sach ky) OR (sach ty))) or (sac ky)) nang ma hoi. hieu van hac thuc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((((sach ky) OR (sach ty))) OR (sac ky)) nang ma hoi. hieu van hac thuc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((((sach ky) OR (sach ty))) or (sac ky)) nang ma hoi. hieu van hac thuc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((((sach ky) OR (sach ty))) or (sac ky)) nang ma hoi. hieu van hac thuc va thanh vi cua tre*.