Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cam loc » cam lo
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
loc van » luoc van, hoc van, lo van
hieu ve » hieu va, hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
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: ((te sach) OR (toc sach)) ky sang xa hoi. hieu ve cam loc van hanh ((lai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky sang xa hoi. hieu ve cam loc van hanh ((lai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky sang xa hoi. hieu ve cam loc van hanh ((lai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky sang xa hoi. hieu ve cam loc van hanh ((lai cua) or (hai cua)) tre*.