Perhaps you should try some spelling variations:
nang tai » hang tai, sang tai, nang cao
hanh vai » hanh vi, hanh va, hanh tai
tang tai » hang tai, dung tai, sang tao
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
loc va » hoc va
su sac » su sach, su cac, su xac
luc va » duc va, tuc va
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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)) roi. hieu ve cam ((luc va) OR (loc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang tai) OR (tang tai)) roi. hieu ve cam ((luc va) OR (loc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang tai) or (tang tai)) roi. hieu ve cam ((luc va) OR (loc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang tai) or (tang tai)) roi. hieu ve cam ((luc va) OR (loc va)) hanh vai cua tre*.