Perhaps you should try some spelling variations:
dat hoang » dang hoang, dai khoang, van hoang
nam thuc » nam thuoc, nam thu, nam tu
dat hang » dat khanh, dat quang, tat thang
cua viet » ca viet, hoa viet, cua vat
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
hai cua » thai cua, dai cua, hoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang xa hoi. hieu he ((nam thuc) or (am thuc)) ((dat hoang) OR (dat hang)) hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang xa hoi. hieu he ((nam thuc) OR (am thuc)) ((dat hoang) OR (dat hang)) hai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang xa hoi. hieu he ((nam thuc) or (am thuc)) ((dat hoang) OR (dat hang)) hai cua viet*".