Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
cong tac » cong ty
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va danh, ban hanh
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
tac hoi » tao hoi, tay hoi, tac hai
ly cong » li cong, ky cong, le cong
va cam » va cham, va cac, va cao
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: doc sach ly cong tac hoi. hieu va cam xuc ((((va hanh) OR (va thanh))) or (va dinh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ly cong tac hoi. hieu va cam xuc ((((va hanh) OR (va thanh))) OR (va dinh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ly cong tac hoi. hieu va cam xuc ((((va hanh) OR (va thanh))) or (va dinh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach ly cong tac hoi. hieu va cam xuc ((((va hanh) OR (va thanh))) or (va dinh)) vai cua te*.