Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hang hai » hoang hai, hang tai, thanh hai
tu sach » su sach, te sach, tu cach
cao duc » dao duc, cao suc, giao duc
hai cua » thai cua, dai cua, hoi cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hang » van hang, va nang, va lang
cam duc » cam xuc, pham duc, nam duoc
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: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve ((cam duc) or (cao duc)) va hang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve ((cam duc) OR (cao duc)) va hang hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu ve ((cam duc) or (cao duc)) va hang hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve ((cam duc) or (cao duc)) va hang hai cua te*.