Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cam duc » cam xuc, cao duc, pham duc
vi cua » vai cua, di cua
dau vi » dau ve, dau va, dat vi
va dau » va dao
ve cam » ve cham, ve cac, va cam
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 sach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve cam duc va dau vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve cam duc va dau vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve cam duc va dau vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky ((nang ma) OR (tang ma)) hoi. hieu ve cam duc va dau vi cua te*.