Perhaps you should try some spelling variations:
nang tai » hang tai, sang tai, nang cao
danh hai » dang hai, lanh hai, manh hai
tang tai » hang tai, dung tai, sang tao
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
luc va » tuc va, loc va
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang tai) OR (tang tai)) hoi. hieu ve cac ((luc va) or (duc va)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang tai) OR (tang tai)) hoi. hieu ve cac ((luc va) OR (duc va)) danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang tai) OR (tang tai)) hoi. hieu ve cac ((luc va) or (duc va)) danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang tai) OR (tang tai)) hoi. hieu ve cac ((luc va) or (duc va)) danh hai cua tre*.