Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hoc » van hoa
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
van hoi » van hoa, van hoe, van loi
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
xuc va » duc va, tuc va, luc va
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 lang ((van hoi) OR (van hoc)). hieu va cac xuc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang ((van hoi) OR (van hoc)). hieu va cac xuc va hanh vi cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky lang ((van hoi) OR (van hoc)). hieu va cac xuc va hanh vi cau tren*".