Perhaps you should try some spelling variations:
dang xay » dang van, van xay
sach thu » sach thue, sach tham, cach thuc
hoc vat » hoc va, hoc viet, thuc vat
hoc van » hoc dan, hoc va, hoc phan
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
xay hoi » xa hoi, tay hoi, cay phoi
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 thu) OR (sach thieu)) dang xay hoi. hieu vu kham ((hoc van) or (hoc vat)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thieu)) dang xay hoi. hieu vu kham ((hoc van) OR (hoc vat)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thieu)) dang xay hoi. hieu vu kham ((hoc van) or (hoc vat)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach thieu)) dang xay hoi. hieu vu kham ((hoc van) or (hoc vat)) hanh vi cuu tre*.