Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
hinh tai » chinh tai, hinh thai, hinh bai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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

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