Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
hanh va » hang va
cua tre » cua te, cuu tre, cua triet
sinh v » sinh va, sinh y, sinh vat
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh v nang xa hoi. ((hieu va) or (hieu van)) cam duc va ((hanh va) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh v nang xa hoi. ((hieu va) OR (hieu van)) cam duc va ((hanh va) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh v nang xa hoi. ((hieu va) or (hieu van)) cam duc va ((hanh va) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh v nang xa hoi. ((hieu va) or (hieu van)) cam duc va ((hanh va) OR (hanh vi)) cua tre*.