Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van
hanh doi » thanh doi, hanh noi, hang doi
sach ly » sach y, sach lo, sach ty
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
nam loc » nam moc, nam soc, nam duoc
hieu va » lieu va, hieu qua
nam lo » nam bo, nam so, nam co
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: thu sach ly ((dang xay) OR (van xay)) hoi. hieu va ((nam loc) or (nam lo)) va hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly ((dang xay) OR (van xay)) hoi. hieu va ((nam loc) OR (nam lo)) va hanh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly ((dang xay) OR (van xay)) hoi. hieu va ((nam loc) or (nam lo)) va hanh doi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ly ((dang xay) OR (van xay)) hoi. hieu va ((nam loc) or (nam lo)) va hanh doi cua te*.