Perhaps you should try some spelling variations:
hien hanh » dieu hanh
trinh van » trinh han, trinh quan, trinh toan
hieu hien » bieu hien, dieu hien, chieu chien
va trinh » van trinh, va tinh, lap trinh
hanh xuc » hanh xu, hanh phuc, hanh duoc
sach ky » sac ky, sach ty, sach kem
van phu » san phu, van phung, van phan
phu tre » phu tran, phu troi, thuc tre
xuc va » duc va, tuc va, luc va
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: tu ((sach ky) or (sach y)) nang ((x hoi) OR (o hoi)). hieu hien hanh xuc va trinh van phu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((x hoi) OR (o hoi)). hieu hien hanh xuc va trinh van phu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang ((x hoi) OR (o hoi)). hieu hien hanh xuc va trinh van phu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((x hoi) OR (o hoi)). hieu hien hanh xuc va trinh van phu tre*.