Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
thu sach » thuat sach, thuoc sach, thu hoach
van tuan » van quan, van ban, anh tuan
lang mai » lang dai, lang hai, lang man
ve cham » va cham, ve chat, vu cham
tuan di » tuan do, truan doi, quan doi
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
y lang » o lang, _ lang, tay lang
di cua » dai cua, doi cua, de cua
ve cam » ve cac, va cam, ve cai

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 lang mai hoi. hieu ((ve cam) or (ve cham)) xuc van tuan di cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y lang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van tuan di cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y lang mai hoi. hieu ((ve cam) or (ve cham)) xuc van tuan di cua quoc*.