Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
lay lung » xay dung, tay nung, tay vung
lung hoa » luong hoa, ung hoa, hung hoa
hieu van » hieu va, thien van, lieu va
sach lay » sach hay, sach nay, sach vay
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
cau luc » cau phuc
vi cua » vai cua, di cua
cua su » qua su

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 lay lung hoa hoi. hieu van ((cau luc) or (cau truc)) ((van hanh) OR (van thanh)) vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lay lung hoa hoi. hieu van ((cau luc) OR (cau truc)) ((van hanh) OR (van thanh)) vi cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lay lung hoa hoi. hieu van ((cau luc) or (cau truc)) ((van hanh) OR (van thanh)) vi cua su*".