Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va tinh » may tinh
vu cham » va cham, vu kham, tu cham
ve chim » va chim, ve cham, ve chinh
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
vai va » mai va, dai va, hai va
bi va » bo va
thiet » thieu

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 y nang ma hoa. hieu ((ve chim) or (vu cham)) tuc va tinh ((bi va) or (vai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoa. hieu ((ve chim) OR (vu cham)) tuc va tinh ((bi va) OR (vai va)) thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. hieu ((ve chim) or (vu cham)) tuc va tinh ((bi va) or (vai va)) thiet*.