Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va hac » van hac, va khac, va cac
sac ky » cac ky, sai ky
tuc va » truc va, tuc xa, duc va
vi cuu » vi luu, vinh cuu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

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