Perhaps you should try some spelling variations:
quan hai » quan ha, qua hai, quan tai
tuan hai » tuan khai, tran hai, tuan tai
luc van » luoc van, luu van, duc van
thu sai » thu hai, thu tai, thu san
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
ve cac » va cac, vien cac
ho hoi » hoc hoi, hoa hoi, hoi 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 sai ky nang ho hoi. hieu ((ve cac) or (vien bach)) luc van ((tuan hai) or (quan hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang ho hoi. hieu ((ve cac) OR (vien bach)) luc van ((tuan hai) OR (quan hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang ho hoi. hieu ((ve cac) or (vien bach)) luc van ((tuan hai) or (quan hai)) cua tre*.