Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
anh tang » anh bang, anh dang, anh sang
anh nang » ganh nang, anh bang, anh dang
cua dung » cua dang, cua dong, qua dung
cong vat » dong vat, cong va, cang vat
vat phan » va phan, van phan, sat phan
phan dau » phan tu, hang dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo tieu)) xanh - ((anh tang) OR (anh nang)) cua dung cong vat phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo tieu)) xanh - ((anh tang) OR (anh nang)) cua dung cong vat phan dau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo tieu)) xanh - ((anh tang) OR (anh nang)) cua dung cong vat phan dau*.