Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh dai » hanh tai, hanh dao, vanh dai
dang van » hoang van, hang va
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
loc va » hoc va, luc va
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac

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 (dang van)) hoi. hieu ((ve cac) OR (vien cac)) loc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (dang van)) hoi. hieu ((ve cac) OR (vien cac)) loc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (dang van)) hoi. hieu ((ve cac) OR (vien cac)) loc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (dang van)) hoi. hieu ((ve cac) OR (vien cac)) loc va hanh dai cua tre*.