Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
vi cua » vai cua, di cua
sinh y » sinh 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 sinh y ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu van)) cam duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu van)) cam duc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh y ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu van)) cam duc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh y ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu van)) cam duc va thanh vi cua tre*.