Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
cam loc » cam lo
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
ho hoi » hoc hoi, hoa hoi, hoi hoi
y nang » ky nang, v nang, may nang
va cam » va cham, va cac, va cao
cua te » cua tu

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 (ly nang)) ho hoi. hieu va cam loc ((va tinh) or (may tinh)) van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) ho hoi. hieu va cam loc ((va tinh) OR (may tinh)) van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) ho hoi. hieu va cam loc ((va tinh) or (may tinh)) van cua te*".