Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hoc cac » hoc cao
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cac toi » cac thoi
cac toc » cac nuoc, cac thoi
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
cuu tre » cau tren, cau treo
cac ly » cac ky, cac le, cam ly

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 xa hoi. hieu va ((cac toc) OR (cac toi)) va hanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ly hang xa hoi. hieu va ((cac toc) OR (cac toi)) va hanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc cac ly hang xa hoi. hieu va ((cac toc) OR (cac toi)) va hanh tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc cac ly hang xa hoi. hieu va ((cac toc) OR (cac toi)) va hanh tai ((cua tre) or (cuu tre))*.