Perhaps you should try some spelling variations:
gianh dai » gianh lai, gian dan, giang day
van gianh » van giang, va gianh, van gian
cua viet » hoa viet, cua vat, cua dieu
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) or (ky nang)) xa hoi. hieu ve pham duc van gianh dai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) xa hoi. hieu ve pham duc van gianh dai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) xa hoi. hieu ve pham duc van gianh dai ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) xa hoi. hieu ve pham duc van gianh dai ((cua viet) OR (ca viet))*.