Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cuc tre » duc tre, cua tre, cuu tre
cac duc » cac du, cao duc, cac dac
nang ra » nang ma, lang ra, nang ro
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu bac
ra lai » ra glai, ru lai, va lai
tu san » thu san, tu ban, tu can
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu san)) ky nang ra lai. hieu ve cac duc van ((hanh tai) OR (hang tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang ra lai. hieu ve cac duc van ((hanh tai) OR (hang tai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu san)) ky nang ra lai. hieu ve cac duc van ((hanh tai) OR (hang tai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang ra lai. hieu ve cac duc van ((hanh tai) OR (hang tai)) cuc tre*.