Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thu sach » thuat sach, thuoc sach, thu hoach
phat xuc » chat xuc, phat xuat, phap xu
van hoe » van hoa, van hoc, van hieu
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
vi dau » vi dai, va dau, bi dau

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 va phat xuc va hanh vi dau 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 va phat xuc va hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky lang ((van hoi) or (van hoe)). hieu va phat xuc va hanh vi dau tren*.