Perhaps you should try some spelling variations:
vien cac » vien bach, vien da, gian cac
vien dai » hien dai
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
luc va » duc va, tuc va
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky nang x ho. hieu ((vien cac) OR (vien dai)) ((luc va) or (loc va)) hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky nang x ho. hieu ((vien cac) OR (vien dai)) ((luc va) OR (loc va)) hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky nang x ho. hieu ((vien cac) OR (vien dai)) ((luc va) or (loc va)) hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky nang x ho. hieu ((vien cac) OR (vien dai)) ((luc va) or (loc va)) hanh doi cua tre*.