Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
va danh » va dinh, va dan, va hanh
danh ki » danh di, danh kien, danh gia
su tien » su kien, su hien, tu tieng
ve cac » va cac, vien cac
dac va » duc va, day va, dat va
ki su » ky su

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 (thuoc sach)) ky nang xa hoi. hieu ve cac dac va danh ki su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ve cac dac va danh ki su tien".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu ve cac dac va danh ki su tien*.