Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hoc nganh » hoc nhanh
cau tren » cu tren, dau tren, ca tren
hoc anh » hoc nhanh, ngoc anh, hoc sinh
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao loc » cao hoc, cao toc, cao oc
va cao » va cac, va co, va dao
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cau » da cau, diem cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (((hoc anh) OR (hoc nganh)))) va nang xa hoi. hieu va cao loc va dan di cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (((hoc anh) OR (hoc nganh)))) va nang xa hoi. hieu va cao loc va dan di cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (((hoc anh) OR (hoc nganh)))) va nang xa hoi. hieu va cao loc va dan di cau tren*.