Perhaps you should try some spelling variations:
van hoanh » van hanh, van doanh, van hoan
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
thu sach » thuat sach, thuoc sach, thu hoach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
hoa xuc » hoa xua, hoa xu, hoa duoc
tu sach » su sach, te sach, tu cach
ma hoi » mai hoi, xa hoi, ma hoa

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)) ty nang ma hoi. hieu van hoa xuc ((ban hanh) or (van hoanh)) lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu van hoa xuc ((ban hanh) OR (van hoanh)) lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ma hoi. hieu van hoa xuc ((ban hanh) or (van hoanh)) lai su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu van hoa xuc ((ban hanh) or (van hoanh)) lai su triet*.