Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh doi » thanh doi, hanh noi, hang doi
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc van » duc va, duc manh, duc phan
doi cua » dai cua, hoi cua, dong cua
y nang » ky nang, ly nang, v nang
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: thu sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc van) or (duc tan)) hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc van) OR (duc tan)) hanh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc van) or (duc tan)) hanh doi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc van) or (duc tan)) hanh doi cua te*.