Perhaps you should try some spelling variations:
thinh tai » chinh tai, trinh tai, thanh tai
hinh tai » chinh tai, hinh thai, hinh bai
hoc cac » hoc cao
cac toc » cac toi, cac nuoc, cac thoi
cuc tre » duc tre, cua tre, cuu tre
cac tuc » cac tu, cac tac, cac nuoc
hieu ve » hieu va, hieu van
hang ca » hang va, nang cao, hang tai
ly hang » ly quang
cac ly » cac ky, cac le, cam ly
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc cac ly hang ca hoi. hieu ve ((cac tuc) OR (cac toc)) xa ((hinh tai) or (thinh tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ly hang ca hoi. hieu ve ((cac tuc) OR (cac toc)) xa ((hinh tai) OR (thinh tai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc cac ly hang ca hoi. hieu ve ((cac tuc) OR (cac toc)) xa ((hinh tai) or (thinh tai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: hoc cac ly hang ca hoi. hieu ve ((cac tuc) OR (cac toc)) xa ((hinh tai) or (thinh tai)) cuc tre*.