Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
vu khach » vu khanh, vu khac, vay khach
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
cham hoc » cham soc, chat hoc, cham hoi
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
co sach » bo sach, cuon sach, hoc sach
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (co sach)) ty tang ma hoi. hieu vu cham hoc va thanh lap ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (co sach)) ty tang ma hoi. hieu vu cham hoc va thanh lap ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (co sach)) ty tang ma hoi. hieu vu cham hoc va thanh lap ((dua tren) or (cuu tre))*.