Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
hanh de » hanh ve, hanh kem
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((hieu va) or (lieu va)) cam duc van hanh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y lang xa hoi. ((hieu va) OR (lieu va)) cam duc van hanh de ve triet.
• Adding a wildcard symbol may retrieve word variants: doc sach y lang xa hoi. ((hieu va) or (lieu va)) cam duc van hanh de ve triet*.