Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
sach ky » sach y, sach ty, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
dau cua » day cua, cau cua, dan cua
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, 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: te ((sach ky) OR (sac ky)) nang mai hoi. hieu va cham soc va dan ((dau cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang mai hoi. hieu va cham soc va dan ((dau cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang mai hoi. hieu va cham soc va dan ((dau cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang mai hoi. hieu va cham soc va dan ((dau cua) or (dai cua)) te*.