Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
trinh tai » trinh tu, trinh han, chinh tai
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 » duc tre, cua tre, cuu tre
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) OR (trinh toan)))) cuc 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) OR (trinh toan)))) cuc 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) OR (trinh toan)))) cuc 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) OR (trinh toan)))) cuc tre*.