Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
thu sach » thuat sach, thuoc sach, thu hoach
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc 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: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ((ve cham) OR (ve chat)) xuc va hanh tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ma hoi. hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet*.