Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu luc » hieu luat, hieu qua
hanh vai » hanh va, hanh tai, hanh van
luc cham » luc tham, tuc cham, phuc cham
cau tren » cu tren, dau tren, ca tren
xang cao » nang cao, lang cao, quang cao
cao hoi » cau hoi, co hoi, cao hoc
cham lo » cham o, cam lo, cham soc
sach ty » sach y, sach tu, sach thu
cua te » cua tu
lo va » lo van, lao va, ly va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty xang cao hoi. hieu luc cham lo va ((hanh vai) OR (hanh vi)) ((cua te) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty xang cao hoi. hieu luc cham lo va ((hanh vai) OR (hanh vi)) ((cua te) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty xang cao hoi. hieu luc cham lo va ((hanh vai) OR (hanh vi)) ((cua te) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty xang cao hoi. hieu luc cham lo va ((hanh vai) OR (hanh vi)) ((cua te) or (cau tren))*.