Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
tu sach » thu sach, te sach, tu cach
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cham xuc van hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cham xuc van hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cham xuc van hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) cham xuc van hanh vi cau tren*.