Perhaps you should try some spelling variations:
thuc hang » thu hang, phuc hang, thuy hang
hang hai » hoang hai, hang tai, thanh hai
cua viet » hoa viet, cua vat, cua dieu
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
he am » he nam, ve am

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

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