Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
duc xanh » duc anh, duc manh, duc hanh
vai cua » hai cua, lai cua, bai cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hai

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 ky) OR (sac ky)) nang o hoi. hieu ve cam duc xanh hanh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang o hoi. hieu ve cam duc xanh hanh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) nang o hoi. hieu ve cam duc xanh hanh ((vai cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) nang o hoi. hieu ve cam duc xanh hanh ((vai cua) or (dai cua)) te*.