Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va danh, ban hanh
cac duc » cac du, cao duc, cac dac
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cac » va cac, vien cac
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 ly ((nang xa) or (nang ma)) hoi. hieu ve cac duc ((va hanh) OR (va thanh)) doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((nang xa) OR (nang ma)) hoi. hieu ve cac duc ((va hanh) OR (va thanh)) doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly ((nang xa) or (nang ma)) hoi. hieu ve cac duc ((va hanh) OR (va thanh)) doi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((nang xa) or (nang ma)) hoi. hieu ve cac duc ((va hanh) OR (va thanh)) doi cua te*.