Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham cuu » cap cuu, chat cua
tinh bai » tinh bac, tinh hai, hinh bai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ca tre » ca tren, cua tre, va tre
cuu va » cuu van, cuu ve
tru » truc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky lang xa hoi. hieu ve cham cuu va ((tinh bai) or (tinh chat)) ((ca tre) or (ca tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu ve cham cuu va ((tinh bai) OR (tinh chat)) ((ca tre) OR (ca tru)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu ve cham cuu va ((tinh bai) or (tinh chat)) ((ca tre) or (ca tru))*.