Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang
du tren » dua tren, dau tren, duc tren
xuc va » duc va, tuc va, luc va
vi du » vi dum, va du, ve du

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 (thu sach)) ky lang ((van hoi) OR (van hoe)). hieu van chat xuc va hanh vi du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang ((van hoi) OR (van hoe)). hieu van chat xuc va hanh vi du tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky lang ((van hoi) OR (van hoe)). hieu van chat xuc va hanh vi du tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky lang ((van hoi) OR (van hoe)). hieu van chat xuc va hanh vi du tren*.