Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lai cua » hai cua, lai chau, thai cua
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cam lo » nam lo, cam ly, cam o

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 ky tang xa hoi. hieu va ((cam loc) OR (cam lo)) van hanh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. hieu va ((cam loc) OR (cam lo)) van hanh ((lai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. hieu va ((cam loc) OR (cam lo)) van hanh ((lai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. hieu va ((cam loc) OR (cam lo)) van hanh ((lai cua) or (dai cua)) tre*.