Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va trien » va truyen, va tuyen, va tieng
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
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 nang ma hoi. hieu ve cam xuc ((va hanh) or (va thanh)) dai ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu ve cam xuc ((va hanh) OR (va thanh)) dai ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu ve cam xuc ((va hanh) or (va thanh)) dai ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu ve cam xuc ((va hanh) or (va thanh)) dai ((va trien) OR (va thiet))*.