Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cam truc » cau truc, nam truc, lam truoc
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
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: su sach y nang ma hoi. hieu va cam truc ((va hanh) or (((va dinh) OR (va tinh)))) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu va cam truc ((va hanh) OR (((va dinh) OR (va tinh)))) va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu va cam truc ((va hanh) or (((va dinh) OR (va tinh)))) va su triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu va cam truc ((va hanh) or (((va dinh) OR (va tinh)))) va su triet*.