Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
thi nang » thi cong, ki nang, thi hanh
so sach » so sanh, co sach, hoc sach
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca cua
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: ((so sach) or (bo sach)) thi nang ma hoi. hieu ((ve pham) OR (ve phan)) duc va thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) thi nang ma hoi. hieu ((ve pham) OR (ve phan)) duc va thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) thi nang ma hoi. hieu ((ve pham) OR (ve phan)) duc va thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) thi nang ma hoi. hieu ((ve pham) OR (ve phan)) duc va thanh va cua te*.