Perhaps you should try some spelling variations:
tham luc » tham nuoc, tham thuc, nhan luc
than luc » nhan luc, than duc, thanh luu
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

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