Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
tham hoc » thai hoc, than hoc, thao hoc
tham hoa » pham hoa, thanh hoa, pham khoa
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

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