Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thai va » thai van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, lai va
hai va » hai van, hoi va, mai va
xuc va » duc va, tuc va, luc va
thiet » thieu

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 y nang ma hoi. hieu va cham xuc va hanh ((vai va) or (((hai va) OR (thai va)))) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu va cham xuc va hanh ((vai va) OR (((hai va) OR (thai va)))) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu va cham xuc va hanh ((vai va) or (((hai va) OR (thai va)))) thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu va cham xuc va hanh ((vai va) or (((hai va) OR (thai va)))) thiet*.