Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
duc manh » suc manh, duc anh, duc minh
dang van » hoang van, hang va
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang tai khoa. hieu va cam ((xuc van) or (duc manh)) dang van ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang tai khoa. hieu va cam ((xuc van) OR (duc manh)) dang van ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang tai khoa. hieu va cam ((xuc van) or (duc manh)) dang van ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang tai khoa. hieu va cam ((xuc van) or (duc manh)) dang van ((cua tu) OR (cua cu))*.