Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
va cham » va chat, va tham
lang xa » lang ha, dang xay, lang van
soc van » hoc van, oc van, sac van
hanh va » hang va, hanh vi
nang ma » tang ma, sang ma, nang cao
va cau » van cau, va cac, va dau

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) OR (thuat sach)) y ((lang xa) or (nang ma)) hoi. lieu va cham soc van hanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y ((lang xa) OR (nang ma)) hoi. lieu va cham soc van hanh va cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) y ((lang xa) or (nang ma)) hoi. lieu va cham soc van hanh va cau tren*".