Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van tuan » van quan, van ban, anh tuan
tuan di » tuan do, truan doi, quan doi
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
dai hoa » dai khoa, dai hoc, day hoa
dai hoi » dai hoc, dai hai, dai moi
ve cau » ke cau, va cau, ve cac
y nang » ky nang, ly nang, v nang
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 ((dai hoa) or (dai hoi)). hieu ve cau luc van tuan di cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y nang ((dai hoa) OR (dai hoi)). hieu ve cau luc van tuan di cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y nang ((dai hoa) or (dai hoi)). hieu ve cau luc van tuan di cua thuoc*.