Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
hai chu » hai chau, hoi chu, hai chi
hoa cau » hoa cac, hoa dau, hoa mau
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cham » va cham, ve chat, vu cham
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) OR (v nang)) mai hoi. hieu ve cham cuu van hanh ((hoa cau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) mai hoi. hieu ve cham cuu van hanh ((hoa cau) OR (hai chu)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) mai hoi. hieu ve cham cuu van hanh ((hoa cau) or (hai chu)) treo".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) mai hoi. hieu ve cham cuu van hanh ((hoa cau) or (hai chu)) treo*.