Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
hieu ve » hieu va, hieu van
cam loc » cam lo
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va dan » ca dan, va dao, va dau
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 (v nang)) xa hoi. hieu ve cam loc ((va danh) or (va dan)) sai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) xa hoi. hieu ve cam loc ((va danh) OR (va dan)) sai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) xa hoi. hieu ve cam loc ((va danh) or (va dan)) sai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) xa hoi. hieu ve cam loc ((va danh) or (va dan)) sai cua te*.