Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
duc manh » suc manh, duc anh, duc minh
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
tu sach » su sach, te sach, tu cach
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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)) ky sang xa hoi. hieu ve cam ((duc va) or (duc manh)) hanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang xa hoi. hieu ve cam ((duc va) OR (duc manh)) hanh lai chau tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang xa hoi. hieu ve cam ((duc va) or (duc manh)) hanh lai chau tre*.