Perhaps you should try some spelling variations:
giang xu » giang xua, gian xu, giang qua
su sach » vu sach
va manh » van manh, va danh, va hanh
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
xu tre » xu tri
bo va » bao va, do va, so va

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) OR (so sach)) ky nang ma hoi. hieu ((va bao) or (va bai)) bo va manh giang xu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang ma hoi. hieu ((va bao) OR (va bai)) bo va manh giang xu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang ma hoi. hieu ((va bao) or (va bai)) bo va manh giang xu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang ma hoi. hieu ((va bao) or (va bai)) bo va manh giang xu tre*.