Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va dinh » van dinh, va kinh, va tinh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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)) 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)) 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)) va su triet*.