Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh mat » thanh dat, thanh mau, thanh mot
tu sach » thu sach, su sach, te sach
ve pham » vi pham, v pham, ve phan
mat cua » ma cua, manh cua, mang cua
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
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: ((tu sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve pham duc van thanh mat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve pham duc van thanh mat cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve pham duc van thanh mat cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve pham duc van thanh mat cua te*.