Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
van han » van phan, van nhan, van hoan
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri 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: su ((sach ky) OR (sach ty)) nang ma hoi. hieu va cham xuc ((van han) or (van hanh)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang ma hoi. hieu va cham xuc ((van han) OR (van hanh)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang ma hoi. hieu va cham xuc ((van han) or (van hanh)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang ma hoi. hieu va cham xuc ((van han) or (van hanh)) tai va thiet*.