Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hoc sach » hoc sinh, hoc cac, hoc anh
vuc nang » cuc nang, vu nang, chuc nang
va thanh » gia thanh, ban thanh, va tinh
co sach » bo sach, cuon sach
nang ma » tang ma, sang ma, nang cao
doi cua » dai cua, hoi cua
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (co sach)) vuc nang ma hoi. hieu ((ve cam) OR (ve cac)) tuc va thanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (co sach)) vuc nang ma hoi. hieu ((ve cam) OR (ve cac)) tuc va thanh doi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (co sach)) vuc nang ma hoi. hieu ((ve cam) OR (ve cac)) tuc va thanh doi cua te*".