Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
mai khoi » tai khoa, cac khoi, dai khoa
van quan » van ban
mai khoa » tai khoa, may khoa, dai khoa
hieu va » lieu va, hieu qua
cam vuc » cam xuc
vuc van » duc van, luc van, thuc van
quan vi » quan li, quan tri, quan doi
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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 hoach)) y nang ((mai khoi) OR (mai khoa)). hieu va cam vuc van quan vi cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y nang ((mai khoi) OR (mai khoa)). hieu va cam vuc van quan vi cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) y nang ((mai khoi) OR (mai khoa)). hieu va cam vuc van quan vi cua quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y nang ((mai khoi) OR (mai khoa)). hieu va cam vuc van quan vi cua quoc*.