Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc anh
qua pham » quan pham, quy pham, qua cham
danh dai » danh dau, danh di, danh sai
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
v nang » va nang, vu nang, van nang
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: ((toc sach) or (((hoc sach) OR (hoc cac)))) v nang xa hoi. hieu qua pham duc va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (((hoc sach) OR (hoc cac)))) v nang xa hoi. hieu qua pham duc va danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (((hoc sach) OR (hoc cac)))) v nang xa hoi. hieu qua pham duc va danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (((hoc sach) OR (hoc cac)))) v nang xa hoi. hieu qua pham duc va danh dai cua te*.