Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
thanh vi » hanh vi, thanh va, nhanh vi
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
cac hoc » cach hoc, cac hop, bac hoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

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