Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
luat tuc » luat thue
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
va luat » va thuat, vay luan, cua luat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tuc » cua duc, cua thuoc, cua nuoc
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
cua tu » cua su, cua cu, cua te

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) or (thu sach)) y nang xa hoi. lieu va luat tuc va hanh di ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. lieu va luat tuc va hanh di ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang xa hoi. lieu va luat tuc va hanh di ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. lieu va luat tuc va hanh di ((cua tu) OR (cua tuc))*.