Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vinh cau » sinh cau, vinh cuu, minh cau
cham duc » pham duc, pham duy, phan duc
cau tren » cu tren, dau tren, ca tren
thi hanh » thi thanh
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va hanh, dia danh
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thi hanh ((cham duc) OR (cham soc)) ((va danh) or (va dan)) vinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thi hanh ((cham duc) OR (cham soc)) ((va danh) OR (va dan)) vinh cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thi hanh ((cham duc) OR (cham soc)) ((va danh) or (va dan)) vinh cau tren*".