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 di » quan doi, quan li, quan vi
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de 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 di 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 di 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 di cua quoc*.