Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thu nang » thi nang, thu hang, thu bang
truc ban » thuc ban, truc dan, truc van
vu sach » vu bach, su sach
tuc ban » thuc ban, tu ban, tuc dan
cuu tre » cua tre, cau tren, cau treo
cao hoi » cau hoi, co hoi, cao hoc
vi cuu » vi luu, vinh cuu
va dau » va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vu khach)) thu nang cao hoi. lieu va dau ((tuc ban) OR (truc ban)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) thu nang cao hoi. lieu va dau ((tuc ban) OR (truc ban)) hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) thu nang cao hoi. lieu va dau ((tuc ban) OR (truc ban)) hanh vi cuu tre*".