Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tru nang » tra nang, tri nang, truc nano
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
tu nong » tu dong, tu cong, tu tong
tu sach » su sach, te sach, tu cach
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau

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

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