Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
cao hoa » cao hoat, cao khoa, cau hoa
cua tuc » cua duc, cua thuoc, luat tuc
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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 y nang cao hoa. hieu ((ve cam) OR (va cam)) duc va dan vi ((cua tu) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cao hoa. hieu ((ve cam) OR (va cam)) duc va dan vi ((cua tu) OR (cua tuc))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang cao hoa. hieu ((ve cam) OR (va cam)) duc va dan vi ((cua tu) or (cua tuc))*".